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              - var btnText1 = 'Submit'
- var btnText2 = 'Share this page'
- var btnText3 = 'Looking good, Billy Ray!'
- var btnText4 = 'Feeling good, Louis!'
- var btnText5 = 'Now go backwards'

h1 Lettering.js Button Hover States
  button.btn.btn--action.btn--one()= btnText1
  button.btn.btn--action.btn--two(data-duration="0.4" data-stagger="0.018")= btnText2
  button.btn.btn--action.btn--three(data-duration="0.2" data-stagger="0.014")= btnText3
  button.btn.btn--action.btn--four(data-duration="0.8" data-stagger="0.04")= btnText4
  button.btn.btn--action.btn--five(data-duration="0.3" data-stagger="-0.014")= btnText5
              @import url('https://fonts.googleapis.com/css?family=Lato:400,700');

$black: black;
$blue: lightblue;
$gray: lightslategray;
$green: darkseagreen;
$red: crimson;
$tan: tan;
$white: white;

$base--font-family: 'Lato', Arial, sans-serif;
$base--trans-speed: 0.4s;
$base--trans-timefunc: cubic-bezier(0.645, 0.045, 0.355, 1);

@function em($pixels, $context: 16) {
  @return #{$pixels/$context}em;

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: em(12);
  min-height: 100vh;

main {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;

h1 {
  margin-bottom: em(24);
  font-family: $base--font-family;
  font-size: em(30);
  line-height: 1.2;
  font-weight: 700;

// Buttons
.btn {
  $btn--padding: em(12) em(24);
  $btn--margin: em(6);
  $btn--offset: 4px;
  $btn--trans: $base--trans-speed $base--trans-timefunc;
  display: inline-block;
  position: relative;
  cursor: pointer;
  overflow: hidden;
  margin: $btn--margin;
  padding: $btn--padding;
  font-size: em(18);
  font-family: $base--font-family;
  text-transform: uppercase;
  letter-spacing: em(0.05);
  border: none;
  border-radius: em(2);
    background-color $btn--trans,
    border-color $btn--trans,
    box-shadow $btn--trans,
    transform $btn--trans;
  &:before {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    transform: translateY(100%);
    transition: transform $btn--trans;
  &:focus {
    transform: translateY(-$btn--offset);
    box-shadow: rgba(black, 0.4) 0 em(6) em(24) em(-6);
    &:before {
      transform: translateY(0);
  &:active {
    transform: translateY(-$btn--offset + 1px);
    transition: transform 0s;
  &--action [class^="word"] {
    display: inline-block;
  &--action [class^="char"] {
    display: inline-block;
    position: relative;
    overflow: hidden;
    z-index: 2;
    &.letter-space {
      width: em(4);
    span {
      display: inline-block;
    span:before {
      content: attr(data-letter);
      display: block;
      position: absolute;
      top: 110%;
      z-index: 3;

// Button configurations
$btn-config: (
  one: ($blue, darken($blue, 10%), $black, $white),
  two: ($green, darken($green, 10%), $black, $white),
  three: ($red, lighten($red, 10%), $white, $black),
  four: ($gray, lighten($gray, 10%), $white, $black),
  five: ($tan, darken($tan, 10%), $black, $white)

@each $name, $option in $btn-config {
  $btn--bg-color: nth($option, 1);
  $btn--bg-color--hover: nth($option, 2);
  $btn--txt-color: nth($option, 3);
  $btn--txt-color--hover: nth($option, 4);
  .btn--#{$name} {
    color: $btn--txt-color;
    background-color: $btn--bg-color;
    &:before {
      background-color: $btn--bg-color--hover;
      background: linear-gradient(to top, $btn--bg-color--hover, transparent);

    &:focus {
      outline-color: $btn--bg-color;
    span:before {
      color: $btn--txt-color--hover;
              var $body = $('body');
var $btnAction = $('.btn--action');
var innerWrapClass = 'inner-wrap';
var $letter, $letterWrapper, $innerWrapper;

// Wrap words

// Wrap letters
$letter = $btnAction.find('[class^="char"]');

// Wrap inner to hide overflow on each letter
$letter.each(function() {
  $letterWrapper = $(this).find('span');
    .attr('data-letter', $(this).text());
  // Add class to text spaces
  if ($letterWrapper.data('letter') === ' ') {

// Setup animation
$btnAction.each(function(index, el) {
  var tl, duration, stagger, anim;
  $innerWrapper = $(el).find('.' + innerWrapClass);
  tl = new TimelineMax({paused: true});
  duration = $(el).attr('data-duration') ? $(el).data('duration') : 0.3;
  stagger = $(el).attr('data-stagger') ? $(el).data('stagger') : 0.03;
  anim = tl.staggerTo($innerWrapper, duration, {
    y: '-110%',
    ease: Back.easeOut
  }, stagger);
  el.animation = anim;
  // Apply animation to hover and focus states
  $(el).on("mouseenter focusin", function() {
  }).on("mouseleave focusout", function() {


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