diff --git a/build/ro.js b/build/ro.js
diff --git a/build/ru.js b/build/ru.js
diff --git a/build/sk.js b/build/sk.js
diff --git a/build/sl.js b/build/sl.js
diff --git a/build/sr.js b/build/sr.js
diff --git a/build/sv.js b/build/sv.js
diff --git a/build/tr.js b/build/tr.js
diff --git a/build/ua.js b/build/ua.js
diff --git a/build/uk.js b/build/uk.js
diff --git a/build/vi.js b/build/vi.js
diff --git a/build/zh-tw.js b/build/zh-tw.js
diff --git a/build/zh.js b/build/zh.js
diff --git a/css/_mixins&keyframes.styl b/css/_mixins&keyframes.styl
@@ -74,4 +74,12 @@ breakpoint(point, value = 0)
 
 @-webkit-keyframes rotate
   0%{-webkit-transform: rotate(0deg);}
-  100%{-webkit-transform: rotate(360deg);}
+  100%{-webkit-transform: rotate(360deg);}
+
+/*
+  Calculates container height based on --vh :root property, set using JavaScript.
+  Includes a fallback to 100vh for browsers that don't support custom properties.
+*/
+calculateHeight()
+  height 100vh
+  height calc(var(--vh, 1vh) * 100)
diff --git a/css/index.styl b/css/index.styl
@@ -148,7 +148,7 @@ loadingSize = 30px
   .auth0-lock-cred-pane-internal-wrapper
     display: flex
     flex-direction: column
-    height 100vh
+    calculateHeight()
     max-height auto
     +breakpoint("mobile")
       max-height: calc(100vh - 40px)
@@ -1048,7 +1048,7 @@ loadingSize = 30px
     .auth0-lock-widget-container
       //mobile view
       @media screen and (max-width: 480px)
-        height 100%
+        calculateHeight()
 
     .auth0-lock-cred-pane
       //mobile view

diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "auth0-lock",
-  "version": "11.20.3",
+  "version": "11.20.4",
   "description": "Auth0 Lock",
   "author": "Auth0 <support@auth0.com> (http://auth0.com)",
   "license": "MIT",

diff --git a/src/__tests__/connection/passwordless/__snapshots__/passwordless.actions.test.js.snap b/src/__tests__/connection/passwordless/__snapshots__/passwordless.actions.test.js.snap
@@ -35,7 +35,14 @@ Array [
 ]
 `;
 
-exports[`passwordless actions login() on webApi.passwordlessVerify() callback formats error when there is an error  1`] = `
+exports[`passwordless actions login() on webApi.passwordlessVerify() callback when there is an error emits the "authorization_error" event 1`] = `
+Array [
+  "model",
+  [Error: foobar],
+]
+`;
+
+exports[`passwordless actions login() on webApi.passwordlessVerify() callback when there is an error formats the error 1`] = `
 Array [
   "updateEntity",
   "lock",
@@ -45,7 +52,7 @@ Array [
 ]
 `;
 
-exports[`passwordless actions login() on webApi.passwordlessVerify() callback formats error when there is an error  2`] = `
+exports[`passwordless actions login() on webApi.passwordlessVerify() callback when there is an error formats the error 2`] = `
 Array [
   "updateEntity",
   "lock",

diff --git a/src/__tests__/connection/passwordless/passwordless.actions.test.js b/src/__tests__/connection/passwordless/passwordless.actions.test.js
@@ -46,7 +46,8 @@ describe('passwordless actions', () => {
             auth: 'params'
           })
         })
-      }
+      },
+      emitAuthorizationErrorEvent: jest.fn()
     }));
     jest.mock('store/index', () => ({
       read: jest.fn(() => 'model'),
@@ -195,26 +196,42 @@ describe('passwordless actions', () => {
       expectMockToMatch(read, 1);
       expectMockToMatch(swap, 1);
     });
+
     it('calls webApi.passwordlessVerify() with sms options', () => {
       actions.logIn('id');
       expectMockToMatch(require('core/web_api').passwordlessVerify, 1);
     });
+
     it('calls webApi.passwordlessVerify() with email options', () => {
       require('connection/passwordless/index').isEmail = () => true;
       actions.logIn('id');
       expectMockToMatch(require('core/web_api').passwordlessVerify, 1);
     });
+
     describe('on webApi.passwordlessVerify() callback', () => {
-      it('formats error when there is an error ', () => {
-        actions.logIn('id');
+      describe('when there is an error', () => {
+        it('formats the error', () => {
+          actions.logIn('id');
 
-        const error = new Error('foobar');
-        error.error = 'some_error_code';
-        require('core/web_api').passwordlessVerify.mock.calls[0][2](error);
+          const error = new Error('foobar');
+          error.error = 'some_error_code';
+          require('core/web_api').passwordlessVerify.mock.calls[0][2](error);
+
+          const { swap } = require('store/index');
+          expectMockToMatch(swap, 2);
+        });
+
+        it('emits the "authorization_error" event', () => {
+          actions.logIn('id');
 
-        const { swap } = require('store/index');
-        expectMockToMatch(swap, 2);
+          const error = new Error('foobar');
+          error.error = 'some_error_code';
+          require('core/web_api').passwordlessVerify.mock.calls[0][2](error);
+
+          expectMockToMatch(require('core/index').emitAuthorizationErrorEvent, 1);
+        });
       });
+
       it('calls logInSuccess on success', () => {
         actions.logIn('id');
         require('core/web_api').passwordlessVerify.mock.calls[0][2](null, { result: true });

diff --git a/src/connection/passwordless/actions.js b/src/connection/passwordless/actions.js
@@ -141,6 +141,7 @@ export function logIn(id) {
       if (error.logToConsole) {
         console.error(error.description);
       }
+      l.emitAuthorizationErrorEvent(m, error);
       return swap(updateEntity, 'lock', id, l.setSubmitting, false, errorMessage);
     } else {
       return logInSuccess(id, result);

diff --git a/src/core.js b/src/core.js
@@ -224,3 +224,15 @@ export function injectStyles() {
     style.innerHTML = css;
   }
 }
+
+/**
+ * Calculates the window innerHeight and sets the --vh style property on :root,
+ * which is then taken advantage of by the CSS.
+ * This important as `innerHeight` will take into account any UI chrome on mobile devices, fixing
+ * an issue where the login button is cut off towards the bottom of the screen.
+ * Values are in pixels multiplied by 1% to convert them to vh.
+ */
+export function setWindowHeightStyle() {
+  const vh = window.innerHeight * 0.01;
+  document.documentElement.style.setProperty('--vh', `${vh}px`);
+}
diff --git a/src/lock.js b/src/lock.js
@@ -1,10 +1,15 @@
-import Core, { injectStyles, css } from './core';
+import Core, { injectStyles, setWindowHeightStyle } from './core';
 import classic from './engine/classic';
 
 export default class Auth0Lock extends Core {
   constructor(clientID, domain, options) {
     super(clientID, domain, options, classic);
     injectStyles();
+    setWindowHeightStyle();
+
+    window.addEventListener('resize', () => {
+      setWindowHeightStyle();
+    });
   }
 }
 

diff --git a/yarn.lock b/yarn.lock
@@ -609,7 +609,7 @@ atob@^2.1.1:
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
   integrity sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==
 
-auth0-js@^9.12.1:
+auth0-js@^9.12.2:
   version "9.12.2"
   resolved "https://registry.yarnpkg.com/auth0-js/-/auth0-js-9.12.2.tgz#8227259a94e8a47eecf8d7a630d99669049833a6"
   integrity sha512-0VfPu5UcgkGKQc7Q8KPqgkqqhLgXGsDCro2tde7hHPYK9JEzOyq82v0szUTHWlwQE1VT8K2/qZAsGDf7hFjI7g==