diff --git a/Gruntfile.js b/Gruntfile.js
index 1a4a60b..a40aa0a 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1,6 +1,7 @@
 module.exports = function(grunt) {
   const projectMap = require('./grunt/project-map.js');
   const sassConfig = require('./grunt/sass');
+  const lessConfig = require('./grunt/less');
   const eslintConfig = require('./grunt/eslint');
   const copyConfig = require('./grunt/copy');
   const uglifyConfig = require('./grunt/uglify');
@@ -20,6 +21,7 @@ module.exports = function(grunt) {
       filename : 'bootstrap-tooltip-custom-class'
     },
     sass: sassConfig,
+    less: lessConfig,
     eslint: eslintConfig,
     copy: copyConfig,
     uglify: uglifyConfig,
@@ -28,6 +30,7 @@ module.exports = function(grunt) {
   });
 
   grunt.loadNpmTasks('grunt-sass');
+  grunt.loadNpmTasks('grunt-contrib-less');
   grunt.loadNpmTasks('grunt-contrib-copy');
   grunt.loadNpmTasks('grunt-contrib-uglify');
   grunt.loadNpmTasks('grunt-contrib-clean');
diff --git a/README.md b/README.md
index 583975e..dcc5f7c 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,18 @@ Include `bootstrap-tooltip-custom-class.css` in your project or use the `.scss`
 Use the mixin `tooltip-custom` to create styles for your custom tooltip:
 ````sass
 .tooltip-custom {
-  @include tooltip-custom(#f2653c);
+  @include tooltip-custom(#f2653c, #fff);
+}
+````
+
+#### Less (only for Bootstrap v3):
+```less
+@import "bootstrap-tooltip-custom-class.less";
+```
+Use the mixin `tooltip-custom`:
+````less
+.tooltip-custom {
+  .tooltip-custom(#f2653c, #fff);
 }
 ````
 
diff --git a/bootstrap-v3/package-lock.json b/bootstrap-v3/package-lock.json
index 51c8bd1..df29f2e 100644
--- a/bootstrap-v3/package-lock.json
+++ b/bootstrap-v3/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "bootstrap-tooltip-custom-class",
-  "version": "1.0.0",
+  "version": "1.0.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/bootstrap-v3/src/less/bootstrap-tooltip-custom-class.less b/bootstrap-v3/src/less/bootstrap-tooltip-custom-class.less
new file mode 100644
index 0000000..6e4af8e
--- /dev/null
+++ b/bootstrap-v3/src/less/bootstrap-tooltip-custom-class.less
@@ -0,0 +1,3 @@
+@import "variables.less";
+@import "mixin.less";
+@import "tooltips.less";
diff --git a/bootstrap-v3/src/less/main.less b/bootstrap-v3/src/less/main.less
new file mode 100644
index 0000000..5a99e8b
--- /dev/null
+++ b/bootstrap-v3/src/less/main.less
@@ -0,0 +1,2 @@
+@import "../../node_modules/bootstrap/less/variables.less";
+@import "bootstrap-tooltip-custom-class.less";
diff --git a/bootstrap-v3/src/less/mixin.less b/bootstrap-v3/src/less/mixin.less
new file mode 100644
index 0000000..50e6b90
--- /dev/null
+++ b/bootstrap-v3/src/less/mixin.less
@@ -0,0 +1,28 @@
+//== Tooltip Custom Mixin
+//
+//##
+
+.tooltip-custom(@bg-color, @color) {
+
+  .tooltip-inner {
+    background-color: @bg-color;
+    color: @color;
+  }
+
+  &.top .tooltip-arrow {
+    border-top-color: @bg-color;
+  }
+
+  &.right .tooltip-arrow {
+    border-right-color: @bg-color;
+  }
+
+  &.left .tooltip-arrow {
+    border-left-color: @bg-color;
+  }
+
+  &.bottom .tooltip-arrow {
+    border-bottom-color: @bg-color;
+  }
+
+}
diff --git a/bootstrap-v3/src/less/tooltips.less b/bootstrap-v3/src/less/tooltips.less
new file mode 100644
index 0000000..442c7b3
--- /dev/null
+++ b/bootstrap-v3/src/less/tooltips.less
@@ -0,0 +1,23 @@
+//== Styles for predefined Tooltip Custom Classes
+//
+//##
+
+.tooltip-primary {
+  .tooltip-custom(@tooltip-primary-bg, @tooltip-color);
+}
+
+.tooltip-success {
+  .tooltip-custom(@tooltip-success-bg, @tooltip-color);
+}
+
+.tooltip-info {
+  .tooltip-custom(@tooltip-info-bg, @tooltip-color);
+}
+
+.tooltip-warning {
+  .tooltip-custom(@tooltip-warning-bg, @tooltip-color);
+}
+
+.tooltip-danger {
+  .tooltip-custom(@tooltip-danger-bg, @tooltip-color);
+}
diff --git a/bootstrap-v3/src/less/variables.less b/bootstrap-v3/src/less/variables.less
new file mode 100644
index 0000000..98930d5
--- /dev/null
+++ b/bootstrap-v3/src/less/variables.less
@@ -0,0 +1,15 @@
+//== Define Bootstrap variables for Tooltips
+//
+//##
+
+//
+// Tooltip primary background color
+@tooltip-primary-bg:        @brand-primary;
+// Tooltip success background color
+@tooltip-success-bg:        @brand-success;
+// Tooltip info background color
+@tooltip-info-bg:           @brand-info;
+// Tooltip warning background color
+@tooltip-warning-bg:        @brand-warning;
+// Tooltip danger background color
+@tooltip-danger-bg:         @brand-danger;
diff --git a/grunt/less.js b/grunt/less.js
new file mode 100644
index 0000000..0fb42d4
--- /dev/null
+++ b/grunt/less.js
@@ -0,0 +1,9 @@
+let config = {
+    v3: {
+        files: {
+            'bootstrap-v3/dist/css/<%= meta.filename %>.less.css': 'bootstrap-v3/src/less/main.less'
+        }
+    }
+};
+
+module.exports = config;
diff --git a/package-lock.json b/package-lock.json
index 9a75056..bd750e4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -55,12 +55,6 @@
         }
       }
     },
-    "@types/minimatch": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
-      "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==",
-      "dev": true
-    },
     "abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
@@ -151,29 +145,18 @@
         }
       }
     },
-    "array-differ": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/array-differ/-/array-differ-3.0.0.tgz",
-      "integrity": "sha512-THtfYS6KtME/yIAhKjZ2ul7XI96lQGHRputJQHO80LAWQnuGP4iCIN8vdMRboGbIEYBwU33q8Tch1os2+X0kMg==",
-      "dev": true
-    },
     "array-find-index": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
       "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
       "dev": true
     },
-    "array-union": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
-      "integrity": "sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==",
-      "dev": true
-    },
-    "arrify": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/arrify/-/arrify-2.0.1.tgz",
-      "integrity": "sha512-3duEwti880xqi4eAMN8AyR4a0ByT90zoYdLlevfrvU43vb0YZwZVfxOgxWrLXXXpyugL0hNZc9G6BiB5B3nUug==",
-      "dev": true
+    "asap": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
+      "integrity": "sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY=",
+      "dev": true,
+      "optional": true
     },
     "asn1": {
       "version": "0.2.4",
@@ -333,18 +316,18 @@
         "wrap-ansi": "^2.0.0"
       }
     },
+    "clone": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.2.tgz",
+      "integrity": "sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18=",
+      "dev": true
+    },
     "code-point-at": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
       "dev": true
     },
-    "coffee-script": {
-      "version": "1.12.7",
-      "resolved": "https://registry.npmjs.org/coffee-script/-/coffee-script-1.12.7.tgz",
-      "integrity": "sha512-fLeEhqwymYat/MpTPUjSKHVYYl0ec2mOyALEMLmzr5i1isuG+6jfI2j2d5oBO3VIzgUXgBVIcOT9uH1TFxBckw==",
-      "dev": true
-    },
     "coffeescript": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/coffeescript/-/coffeescript-1.10.0.tgz",
@@ -415,29 +398,6 @@
         "which": "^1.2.9"
       }
     },
-    "cson": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/cson/-/cson-5.1.0.tgz",
-      "integrity": "sha512-hh97pBcNEc24OQn+CBYu1pp9kcEqp3dE0oO52QIoQkDREnZYHUD1YcKcGvHU+k9lgCmIXHslJfGTie58zjhLnA==",
-      "dev": true,
-      "requires": {
-        "coffee-script": "^1.12.7",
-        "cson-parser": "^1.3.4",
-        "editions": "^1.3.3",
-        "extract-opts": "^3.3.1",
-        "requirefresh": "^2.1.0",
-        "safefs": "^4.1.0"
-      }
-    },
-    "cson-parser": {
-      "version": "1.3.5",
-      "resolved": "https://registry.npmjs.org/cson-parser/-/cson-parser-1.3.5.tgz",
-      "integrity": "sha1-fsZ14DkUVTO/KmqFYHPxWZ2cLSQ=",
-      "dev": true,
-      "requires": {
-        "coffee-script": "^1.10.0"
-      }
-    },
     "currently-unhandled": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/currently-unhandled/-/currently-unhandled-0.4.1.tgz",
@@ -514,16 +474,6 @@
       "integrity": "sha1-rOb/gIwc5mtX0ev5eXessCM0z8E=",
       "dev": true
     },
-    "eachr": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/eachr/-/eachr-3.2.0.tgz",
-      "integrity": "sha1-LDXkPqCGUW95l8+At6pk1VpKRIQ=",
-      "dev": true,
-      "requires": {
-        "editions": "^1.1.1",
-        "typechecker": "^4.3.0"
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     "ecc-jsbn": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz",
@@ -534,43 +484,20 @@
         "safer-buffer": "^2.1.0"
       }
     },
-    "editions": {
-      "version": "1.3.4",
-      "resolved": "https://registry.npmjs.org/editions/-/editions-1.3.4.tgz",
-      "integrity": "sha512-gzao+mxnYDzIysXKMQi/+M1mjy/rjestjg6OPoYTtI+3Izp23oiGZitsl9lPDPiTGXbcSIk1iJWhliSaglxnUg==",
-      "dev": true
-    },
     "emoji-regex": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
       "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
       "dev": true
     },
-    "errlop": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/errlop/-/errlop-1.1.2.tgz",
-      "integrity": "sha512-djkRp+urJ+SmqDBd7F6LUgm4Be1TTYBxia2bhjNdFBuBDQtJDHExD2VbxR6eyst3h1TZy3qPRCdqb6FBoFttTA==",
+    "errno": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/errno/-/errno-0.1.7.tgz",
+      "integrity": "sha512-MfrRBDWzIWifgq6tJj60gkAwtLNb6sQPlcFrSOflcP1aFmmruKQ2wRnze/8V6kgyz7H3FF8Npzv78mZ7XLLflg==",
       "dev": true,
+      "optional": true,
       "requires": {
-        "editions": "^2.1.3"
-      },
-      "dependencies": {
-        "editions": {
-          "version": "2.2.0",
-          "resolved": "https://registry.npmjs.org/editions/-/editions-2.2.0.tgz",
-          "integrity": "sha512-RYg3iEA2BDLCNVe8PUkD+ox5vAKxB9XS/mAhx1bdxGCF0CpX077C0pyTA9t5D6idCYA3avl5/XDHKPsHFrygfw==",
-          "dev": true,
-          "requires": {
-            "errlop": "^1.1.2",
-            "semver": "^6.3.0"
-          }
-        },
-        "semver": {
-          "version": "6.3.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
-          "dev": true
-        }
+        "prr": "~1.0.1"
       }
     },
     "error-ex": {
@@ -807,17 +734,6 @@
         "tmp": "^0.0.33"
       }
     },
-    "extract-opts": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/extract-opts/-/extract-opts-3.3.1.tgz",
-      "integrity": "sha1-WrvtyYwNUgLjJ4cn+Rktfghsa+E=",
-      "dev": true,
-      "requires": {
-        "eachr": "^3.2.0",
-        "editions": "^1.1.1",
-        "typechecker": "^4.3.0"
-      }
-    },
     "extsprintf": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.3.0.tgz",
@@ -1192,6 +1108,29 @@
         "file-sync-cmp": "^0.1.0"
       }
     },
+    "grunt-contrib-less": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/grunt-contrib-less/-/grunt-contrib-less-2.0.0.tgz",
+      "integrity": "sha512-nsaODoEMjVn61OuqPaFeFQpb4Qd/EbfxQDeYnh2oONXm8L5Gnuchtv59kl0V3hjiFdOkZlPILDc3ZrkoZI0PNw==",
+      "dev": true,
+      "requires": {
+        "async": "^2.0.0",
+        "chalk": "^1.0.0",
+        "less": "^3.0.4",
+        "lodash": "^4.17.10"
+      },
+      "dependencies": {
+        "async": {
+          "version": "2.6.3",
+          "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
+          "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+          "dev": true,
+          "requires": {
+            "lodash": "^4.17.14"
+          }
+        }
+      }
+    },
     "grunt-contrib-uglify": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/grunt-contrib-uglify/-/grunt-contrib-uglify-4.0.1.tgz",
@@ -1440,6 +1379,13 @@
       "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==",
       "dev": true
     },
+    "image-size": {
+      "version": "0.5.5",
+      "resolved": "https://registry.npmjs.org/image-size/-/image-size-0.5.5.tgz",
+      "integrity": "sha1-Cd/Uq50g4p6xw+gLiZA3jfnjy5w=",
+      "dev": true,
+      "optional": true
+    },
     "import-fresh": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-3.1.0.tgz",
@@ -1661,12 +1607,6 @@
       "integrity": "sha1-R+Y/evVa+m+S4VAOaQ64uFKcCZo=",
       "dev": true
     },
-    "jit-grunt": {
-      "version": "0.10.0",
-      "resolved": "https://registry.npmjs.org/jit-grunt/-/jit-grunt-0.10.0.tgz",
-      "integrity": "sha1-AIw6f+Hpa9DYTiYOofoXg0V/ecI=",
-      "dev": true
-    },
     "js-base64": {
       "version": "2.5.1",
       "resolved": "https://registry.npmjs.org/js-base64/-/js-base64-2.5.1.tgz",
@@ -1746,56 +1686,40 @@
         "invert-kv": "^1.0.0"
       }
     },
-    "levn": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
-      "integrity": "sha1-OwmSTt+fCDwEkP3UwLxEIeBHZO4=",
-      "dev": true,
-      "requires": {
-        "prelude-ls": "~1.1.2",
-        "type-check": "~0.3.2"
-      }
-    },
-    "load-grunt-config": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/load-grunt-config/-/load-grunt-config-3.0.1.tgz",
-      "integrity": "sha512-kFzYN8roBa+owMyGlEKyui6JzWpM1tMH8xn0AejiLgXAT4Kh275cPwin7GjNrKZKul8viWK0Caa6OaUJLXXpkA==",
+    "less": {
+      "version": "3.10.3",
+      "resolved": "https://registry.npmjs.org/less/-/less-3.10.3.tgz",
+      "integrity": "sha512-vz32vqfgmoxF1h3K4J+yKCtajH0PWmjkIFgbs5d78E/c/e+UQTnI+lWK+1eQRE95PXM2mC3rJlLSSP9VQHnaow==",
       "dev": true,
       "requires": {
-        "cson": "5.1.0",
-        "glob": "7.1.4",
-        "jit-grunt": "0.10.0",
-        "js-yaml": "3.13.1",
-        "load-grunt-tasks": "5.1.0",
-        "lodash": "4.17.15"
+        "clone": "^2.1.2",
+        "errno": "^0.1.1",
+        "graceful-fs": "^4.1.2",
+        "image-size": "~0.5.0",
+        "mime": "^1.4.1",
+        "mkdirp": "^0.5.0",
+        "promise": "^7.1.1",
+        "request": "^2.83.0",
+        "source-map": "~0.6.0"
       },
       "dependencies": {
-        "glob": {
-          "version": "7.1.4",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.4.tgz",
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+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
           "dev": true,
-          "requires": {
-            "fs.realpath": "^1.0.0",
-            "inflight": "^1.0.4",
-            "inherits": "2",
-            "minimatch": "^3.0.4",
-            "once": "^1.3.0",
-            "path-is-absolute": "^1.0.0"
-          }
+          "optional": true
         }
       }
     },
-    "load-grunt-tasks": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/load-grunt-tasks/-/load-grunt-tasks-5.1.0.tgz",
-      "integrity": "sha512-oNj0Jlka1TsfDe+9He0kcA1cRln+TMoTsEByW7ij6kyktNLxBKJtslCFEvFrLC2Dj0S19IWJh3fOCIjLby2Xrg==",
+    "levn": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
+      "integrity": "sha1-OwmSTt+fCDwEkP3UwLxEIeBHZO4=",
       "dev": true,
       "requires": {
-        "arrify": "^2.0.1",
-        "multimatch": "^4.0.0",
-        "pkg-up": "^3.1.0",
-        "resolve-pkg": "^2.0.0"
+        "prelude-ls": "~1.1.2",
+        "type-check": "~0.3.2"
       }
     },
     "load-json-file": {
@@ -1811,24 +1735,6 @@
         "strip-bom": "^2.0.0"
       }
     },
-    "locate-path": {
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-      "dev": true,
-      "requires": {
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diff --git a/package.json b/package.json
index 51a6e94..5fd08fa 100644
--- a/package.json
+++ b/package.json
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 }