diff --git a/README.md b/README.md
index bd84b85..4c61fe4 100644
--- a/README.md
+++ b/README.md
@@ -36,10 +36,13 @@ updateCue | undefined | A prop that indicates that the tooltip's position should
 ```sh
 # watches JS and SCSS for changes and compiles
 # runs tests for associated
-npm start
+npm run watch
 
 # run all tests
 npm test
+
+# creates a demo page at http:localhost:8888/design.html for design purposes
+npm run design
 ```
 
 ## Changelog
diff --git a/cypress/fixtures/example.json b/cypress/fixtures/example.json
deleted file mode 100644
index da18d93..0000000
--- a/cypress/fixtures/example.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "name": "Using fixtures to represent data",
-  "email": "hello@cypress.io",
-  "body": "Fixtures are a great way to mock data for responses to routes"
-}
\ No newline at end of file
diff --git a/cypress/integration/design.js b/cypress/integration/design.js
deleted file mode 100644
index bc0f242..0000000
--- a/cypress/integration/design.js
+++ /dev/null
@@ -1,5 +0,0 @@
-it('design', () => {
-  cy
-    .viewport(600, 400)
-    .visit('http://localhost:8888/design.html')
-})
diff --git a/package-lock.json b/package-lock.json
index f1b0b25..a565026 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1043,6 +1043,101 @@
         "through2": "^2.0.0"
       }
     },
+    "@cypress/listr-verbose-renderer": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/@cypress/listr-verbose-renderer/-/listr-verbose-renderer-0.4.1.tgz",
+      "integrity": "sha1-p3SS9LEdzHxEajSz4ochr9M8ZCo=",
+      "dev": true,
+      "requires": {
+        "chalk": "^1.1.3",
+        "cli-cursor": "^1.0.2",
+        "date-fns": "^1.27.2",
+        "figures": "^1.7.0"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "2.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+          "dev": true
+        },
+        "chalk": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
+          }
+        },
+        "cli-cursor": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-1.0.2.tgz",
+          "integrity": "sha1-ZNo/fValRBLll5S9Ytw1KV6PKYc=",
+          "dev": true,
+          "requires": {
+            "restore-cursor": "^1.0.1"
+          }
+        },
+        "figures": {
+          "version": "1.7.0",
+          "resolved": "https://registry.npmjs.org/figures/-/figures-1.7.0.tgz",
+          "integrity": "sha1-y+Hjr/zxzUS4DK3+0o3Hk6lwHS4=",
+          "dev": true,
+          "requires": {
+            "escape-string-regexp": "^1.0.5",
+            "object-assign": "^4.1.0"
+          }
+        },
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+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+          "integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k=",
+          "dev": true
+        },
+        "restore-cursor": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-1.0.1.tgz",
+          "integrity": "sha1-NGYfRohjJ/7SmRR5FSJS35LapUE=",
+          "dev": true,
+          "requires": {
+            "exit-hook": "^1.0.0",
+            "onetime": "^1.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "dev": true
+        }
+      }
+    },
+    "@cypress/xvfb": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@cypress/xvfb/-/xvfb-1.2.4.tgz",
+      "integrity": "sha512-skbBzPggOVYCbnGgV+0dmBdW/s77ZkAOXIC1knS8NagwDjBrNC1LuXtQJeiN6l+m7lzmHtaoUw/ctJKdqkG57Q==",
+      "dev": true,
+      "requires": {
+        "debug": "^3.1.0",
+        "lodash.once": "^4.1.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "3.2.6",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
+          "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
     "@gulp-sourcemaps/identity-map": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/@gulp-sourcemaps/identity-map/-/identity-map-1.0.2.tgz",
@@ -1877,6 +1972,12 @@
       "integrity": "sha1-aALmJk79GMeQobDVF/DyYnvyyUo=",
       "dev": true
     },
+    "arch": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/arch/-/arch-2.1.1.tgz",
+      "integrity": "sha512-BLM56aPo9vLLFVa8+/+pJLnrZ7QGGTVHWsCwieAWT9o9K8UeGaQbzZbGoabWLOo2ksBCztoXdqBZBplqLDDCSg==",
+      "dev": true
+    },
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@@ -3195,6 +3296,12 @@
         "ieee754": "^1.1.4"
       }
     },
+    "buffer-crc32": {
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+      "resolved": "https://registry.npmjs.org/buffer-crc32/-/buffer-crc32-0.2.13.tgz",
+      "integrity": "sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI=",
+      "dev": true
+    },
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@@ -3256,6 +3363,15 @@
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       "dev": true
     },
+    "cachedir": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/cachedir/-/cachedir-1.3.0.tgz",
+      "integrity": "sha512-O1ji32oyON9laVPJL1IZ5bmwd2cB46VfpxkDequezH+15FDzzVddEyrGEeX4WusDSqKxdyFdDQDEG1yo1GoWkg==",
+      "dev": true,
+      "requires": {
+        "os-homedir": "^1.0.1"
+      }
+    },
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       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/call-me-maybe/-/call-me-maybe-1.0.1.tgz",
@@ -3572,6 +3688,12 @@
         "restore-cursor": "^2.0.0"
       }
     },
+    "cli-spinners": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/cli-spinners/-/cli-spinners-0.1.2.tgz",
+      "integrity": "sha1-u3ZNiOGF+54eaiofGXcjGPYF4xw=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/cli-table/-/cli-table-0.3.1.tgz",
@@ -3589,6 +3711,24 @@
         }
       }
     },
+    "cli-truncate": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/cli-truncate/-/cli-truncate-0.2.1.tgz",
+      "integrity": "sha1-nxXPuwcFAFNpIWxiasfQWrkN1XQ=",
+      "dev": true,
+      "requires": {
+        "slice-ansi": "0.0.4",
+        "string-width": "^1.0.1"
+      },
+      "dependencies": {
+        "slice-ansi": {
+          "version": "0.0.4",
+          "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-0.0.4.tgz",
+          "integrity": "sha1-7b+JA/ZvfOL46v1s7tZeJkyDGzU=",
+          "dev": true
+        }
+      }
+    },
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       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
@@ -3816,6 +3956,12 @@
         "graceful-readlink": ">= 1.0.0"
       }
     },
+    "common-tags": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/common-tags/-/common-tags-1.8.0.tgz",
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+    },
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@@ -4255,6 +4401,174 @@
         "array-find-index": "^1.0.1"
       }
     },
+    "cypress": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/cypress/-/cypress-3.4.0.tgz",
+      "integrity": "sha512-vUE+sK3l23fhs5qTN3dKpveyP0fGr37VmK3FSYaTEjbqC/qh4DbA1Ych/3bLStUpHP4rpE5KAx7i1s/tpdD9vQ==",
+      "dev": true,
+      "requires": {
+        "@cypress/listr-verbose-renderer": "0.4.1",
+        "@cypress/xvfb": "1.2.4",
+        "arch": "2.1.1",
+        "bluebird": "3.5.0",
+        "cachedir": "1.3.0",
+        "chalk": "2.4.2",
+        "check-more-types": "2.24.0",
+        "commander": "2.15.1",
+        "common-tags": "1.8.0",
+        "debug": "3.2.6",
+        "execa": "0.10.0",
+        "executable": "4.1.1",
+        "extract-zip": "1.6.7",
+        "fs-extra": "5.0.0",
+        "getos": "3.1.1",
+        "glob": "7.1.3",
+        "is-ci": "1.2.1",
+        "is-installed-globally": "0.1.0",
+        "lazy-ass": "1.6.0",
+        "listr": "0.12.0",
+        "lodash": "4.17.11",
+        "log-symbols": "2.2.0",
+        "minimist": "1.2.0",
+        "moment": "2.24.0",
+        "ramda": "0.24.1",
+        "request": "2.88.0",
+        "request-progress": "3.0.0",
+        "supports-color": "5.5.0",
+        "tmp": "0.1.0",
+        "url": "0.11.0",
+        "yauzl": "2.10.0"
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@@ -4297,6 +4611,12 @@
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@@ -5577,6 +5903,21 @@
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@@ -5884,6 +6225,59 @@
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       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/lolex/-/lolex-4.1.0.tgz",
@@ -15512,6 +16229,70 @@
         }
       }
     },
+    "ora": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/ora/-/ora-0.2.3.tgz",
+      "integrity": "sha1-N1J9Igrc1Tw5tzVx11QVbV22V6Q=",
+      "dev": true,
+      "requires": {
+        "chalk": "^1.1.1",
+        "cli-cursor": "^1.0.2",
+        "cli-spinners": "^0.1.2",
+        "object-assign": "^4.0.1"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "2.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+          "dev": true
+        },
+        "chalk": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
+          }
+        },
+        "cli-cursor": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-1.0.2.tgz",
+          "integrity": "sha1-ZNo/fValRBLll5S9Ytw1KV6PKYc=",
+          "dev": true,
+          "requires": {
+            "restore-cursor": "^1.0.1"
+          }
+        },
+        "onetime": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+          "integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k=",
+          "dev": true
+        },
+        "restore-cursor": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-1.0.1.tgz",
+          "integrity": "sha1-NGYfRohjJ/7SmRR5FSJS35LapUE=",
+          "dev": true,
+          "requires": {
+            "exit-hook": "^1.0.0",
+            "onetime": "^1.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "dev": true
+        }
+      }
+    },
     "ordered-read-streams": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/ordered-read-streams/-/ordered-read-streams-1.0.1.tgz",
@@ -15985,6 +16766,12 @@
         "sha.js": "^2.4.8"
       }
     },
+    "pend": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/pend/-/pend-1.2.0.tgz",
+      "integrity": "sha1-elfrVQpng/kRUzH89GY9XI4AelA=",
+      "dev": true
+    },
     "performance-now": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
@@ -16889,6 +17676,15 @@
         "uuid": "^3.3.2"
       }
     },
+    "request-progress": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/request-progress/-/request-progress-3.0.0.tgz",
+      "integrity": "sha1-TKdUCBx/7GP1BeT6qCWqBs1mnb4=",
+      "dev": true,
+      "requires": {
+        "throttleit": "^1.0.0"
+      }
+    },
     "request-promise-core": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/request-promise-core/-/request-promise-core-1.1.2.tgz",
@@ -18132,6 +18928,12 @@
         "any-promise": "^1.1.0"
       }
     },
+    "stream-to-observable": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/stream-to-observable/-/stream-to-observable-0.1.0.tgz",
+      "integrity": "sha1-Rb8dny19wJvtgfHDB8Qw5ouEz/4=",
+      "dev": true
+    },
     "stream-to-promise": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/stream-to-promise/-/stream-to-promise-2.2.0.tgz",
@@ -18371,6 +19173,12 @@
         "es6-symbol": "^3.1.1"
       }
     },
+    "symbol-observable": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/symbol-observable/-/symbol-observable-1.0.1.tgz",
+      "integrity": "sha1-g0D8RwLDEi310iKI+IKD9RPT/dQ=",
+      "dev": true
+    },
     "symbol-tree": {
       "version": "3.2.4",
       "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
@@ -18506,6 +19314,12 @@
       "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
       "dev": true
     },
+    "throttleit": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/throttleit/-/throttleit-1.0.0.tgz",
+      "integrity": "sha1-nnhYNtr0Z0MUWlmEtiaNgoUorGw=",
+      "dev": true
+    },
     "through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -20223,6 +21037,27 @@
         }
       }
     },
+    "yauzl": {
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
+      "dev": true,
+      "requires": {
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
+      },
+      "dependencies": {
+        "fd-slicer": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/fd-slicer/-/fd-slicer-1.1.0.tgz",
+          "integrity": "sha1-JcfInLH5B3+IkbvmHY85Dq4lbx4=",
+          "dev": true,
+          "requires": {
+            "pend": "~1.2.0"
+          }
+        }
+      }
+    },
     "zunder": {
       "version": "6.4.2",
       "resolved": "https://registry.npmjs.org/zunder/-/zunder-6.4.2.tgz",
diff --git a/package.json b/package.json
index c23eec7..e71e594 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,8 @@
     "lint": "eslint --fix src/*.jsx",
     "precommit": "npm run lint",
     "prepublish": "npm run build-prod",
-    "start": "node ./scripts/watch.js --port 8888",
+    "design": "node ./scripts/design.js --port 8888",
+    "watch": "node ./scripts/watch.js",
     "test": "node ./scripts/test.js",
     "semantic-release": "semantic-release"
   },
diff --git a/scripts/design.js b/scripts/design.js
new file mode 100644
index 0000000..77ceb4c
--- /dev/null
+++ b/scripts/design.js
@@ -0,0 +1,22 @@
+const fs = require('fs-extra')
+const z = require('zunder')
+const u = z.undertaker
+const setZunderConfig = require('./set-zunder-config')
+const copyScss = require('./copy-scss')
+
+const ensureDevDir = () => fs.ensureDir(z.config.devDir)
+
+setZunderConfig(z)
+
+u.series(
+  z.applyDevEnv,
+  z.cleanDev,
+  ensureDevDir,
+  copyScss(z.config.devDir),
+  u.parallel(
+    z.watchServer,
+    z.watchStaticAssets,
+    z.watchScripts,
+    z.watchStylesheets
+  )
+)()
diff --git a/scripts/watch.js b/scripts/watch.js
index ccecfd5..eac69be 100644
--- a/scripts/watch.js
+++ b/scripts/watch.js
@@ -8,19 +8,12 @@ const ensureDevDir = () => fs.ensureDir(z.config.devDir)
 
 setZunderConfig(z)
 
-// TODO: watch scss, so it's copied on change
-
 u.series(
   z.applyDevEnv,
   z.cleanDev,
   ensureDevDir,
   copyScss(z.config.devDir),
   u.parallel(
-    // need these for 'design' mode, but z.watchScripts conflicts with z.watchTests
-    // because testDir and devDir are the same. need to fix in zunder
-    // z.watchServer,
-    // z.watchStaticAssets,
-    // z.watchScripts,
     z.watchTests,
     z.watchStylesheets
   )
diff --git a/src/main.jsx b/src/main.jsx
index f4e3ee7..f620258 100644
--- a/src/main.jsx
+++ b/src/main.jsx
@@ -4,6 +4,11 @@ import Tooltip from './tooltip'
 
 const Design = () => (
   <div>
+    <h1>Demo</h1>
+    <Tooltip title="Hello World">
+      <button>Click me</button>
+    </Tooltip>
+    <h1>Placement</h1>
     <p>
       <Tooltip title='The tooltip text' visible={true} placement='top'>
         <span>top</span>
diff --git a/src/portal-popper.jsx b/src/portal-popper.jsx
index 59cf4b9..24ab7cf 100644
--- a/src/portal-popper.jsx
+++ b/src/portal-popper.jsx
@@ -124,7 +124,9 @@ class PortalPopper extends Component {
   }
 
   _getArrowProp (position) {
-    return _.isNumber(this.state.arrowProps[position]) ? Math.round(this.state.arrowProps[position]) : null
+    const prop = this.state.arrowProps[position]
+
+    return _.isNumber(prop) && !_.isNaN(prop) ? Math.round(prop) : null
   }
 
   componentWillUnmount () {
diff --git a/src/portal-popper.spec.jsx b/src/portal-popper.spec.jsx
index 592f8e8..cd25b58 100644
--- a/src/portal-popper.spec.jsx
+++ b/src/portal-popper.spec.jsx
@@ -144,6 +144,19 @@ describe('<PortalPopper />', () => {
       expect(style.top).to.equal(20)
     })
 
+    it('only updates the arrow props that are numbers and not NaN', () => {
+      const popperInstance = popperInstanceStub()
+      const Popper = popperStub(popperInstance)
+      const component = mount(<PortalPopper {...getProps({ Popper })} />)
+
+      Popper.firstCall.args[2].onUpdate({ offsets: { arrow: { top: NaN, left: 30 } } })
+      component.update()
+      const style = component.find('.tooltip-arrow').prop('style')
+
+      expect(style.left).to.equal(30)
+      expect(style.top).to.equal(null)
+    })
+
     it('rounds the arrow props', () => {
       const popperInstance = popperInstanceStub()
       const Popper = popperStub(popperInstance)
diff --git a/static/design.html b/static/design.html
index 64211f9..2e08fc2 100644
--- a/static/design.html
+++ b/static/design.html
@@ -5,12 +5,17 @@
   <style>
     body {
       font-family: sans-serif;
+      padding: 10px 30px;
+    }
+
+    h1 {
+      margin: 40px 0;
     }
 
     p {
       cursor: default;
       float: left;
-      margin: 100px;
+      margin: 20px 100px;
     }
   </style>
 </head>