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HTML

              
                <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.1/css/font-awesome.min.css">
<link href='https://fonts.googleapis.com/css?family=Open+Sans:300,800' rel='stylesheet' type='text/css'>

<div class="button-container right">
  <a href="http://www.pipiaco.com/en/" target="_blank">
    <div class="button round">
      <i class="fa fa-envira" aria-hidden="true"></i>
      <span>leaf</span>
    </div>
  </a>
</div>
<div class="button-container left">
  <a href="http://www.pipiaco.com/en/" target="_blank">
    <div class="button round">
      <i class="fa fa-heart" aria-hidden="true"></i>
      <span>love</span>
    </div>
  </a>
</div>
<div class="container">
  <h2>Pen made by <a href="http://www.pipiaco.com/en/" target="_blank">Philip M.</a></h2>
</div>
              
            
!

CSS

              
                $white: #404040;
$dark_purple: #ffffff;

body,
html {
  font-family: Open Sans;
  color: #4d4d4d;
}

h2 {
  font-weight: 300;
}

h2 a {
  font-weight: 800;
  text-decoration: none;
  color: #2eb82e;
}

h2 a:hover {
  opacity: .7;
}

.container {
  text-align: center;
  bottom: 5%;
  left: 50%;
  transform: translateX(-50%);
  position: absolute;
}


@import url(http://weloveiconfonts.com/api/?family=fontawesome);
@import "compass";

@mixin font($font, $style: normal, $weight: normal) {
    font-family: $font, "Arial";
    font-style:  $style;
    font-weight: $weight;
}
@mixin fill-width-height($width:100%, $height:100%) {
	width: $width;
	height: $height;
}
@mixin no-select {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
@mixin centre($axis: "both"){
    position:absolute;
    @if $axis == "y"{
        top:50%;
        -webkit-transform: translateY(-50%);
        -moz-transform: translateY(-50%);
        -ms-transform: translateY(-50%);
        -o-transform: translateY(-50%);
        transform: translateY(-50%);
    }
    @if $axis == "x"{
        left:50%;
        -webkit-transform: translateX(-50%);
        -moz-transform: translateX(-50%);
        -ms-transform: translateX(-50%);
        -o-transform: translateX(-50%);
        transform: translateX(-50%);
    }
    @if $axis == "both"{
        top:50%;
        left:50%;
        -webkit-transform: translate(-50%, -50%);
        -moz-transform: translate(-50%, -50%);
        -ms-transform: translate(-50%, -50%);
        -o-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
    }   
}
.button-container.left {
  left: calc(50% - 100px);
  
    [class^="fa"]:before,
    [class*=" fa-"]:before {
        @include centre();
        margin: 0;
        @include transition-property(opacity);
        @include transition-duration(0.3s);
        @include transition-timing-function(ease-out);
        color: #ff1a1a;
    }
}
.button-container.right {
  left: calc(50% - 0px);
  
    [class^="fa"]:before,
    [class*=" fa-"]:before {
        @include centre();
        margin: 0;
        @include transition-property(opacity);
        @include transition-duration(0.3s);
        @include transition-timing-function(ease-out);
        color: #2eb82e;
    }
}
.button-container {
  top: 50%;
  transform: translateY(-50%);
  position: absolute;
  width: 100px;
  /*MAKE SURE THIS IS TWICE THE SIZE OF THE HEIGHT*/
  height: 100px;
}
.button.round {
    @include centre(x);
    position: relative;
    width: 4em;
    height: 4em;
    @include border-radius(4em);
    @include transition-property(color, border, transform);
    @include transition-duration(0.1s);
    @include transition-timing-function(ease-in);
    @include no-select;
    color: $white;
    line-height: 1.5em;
    cursor: pointer;
    border-color: rgba($white, 0.8);


    &.loading span:not(.loading-text),
    &.loading i {
        @include opacity(0);
    }
    &.loading:after {
        @include border-radius(0);
        @include transform(translate(-50%, -50%) rotate(45deg));
        border: none;
    }
    &.loading:hover:before {
        @include transform(translate(-50%, -20%) rotate(45deg));
        @include opacity(.1);
    }
    &.loading:before {
        @include border-radius(0);
        @include transform(translate(-50%, -40%) rotate(45deg));
        @include fill-width-height(100%, 100%);
        @include opacity(.1);
    }

    &:before {
        content: " ";
        @include opacity(0);
        @include fill-width-height(0%, 0%);
        @include centre();
        @include border-radius(4em);
        @include transition-property(width, height, opacity, border-radius, transform);
        @include transition-duration(0.2s);
        @include transition-timing-function(ease-in);
        position: absolute;
        background: $white;
    }
    &:after {
        content: " ";
        @include fill-width-height();
        @include centre();
        @include border-radius(30em);
        @include transition-property(width, height, opacity, border-radius, transform);
        @include transition-delay(0.17s);
        @include transition-duration(0.3s);
        @include transition-timing-function(ease-out);
        border: solid 1px $white;
        position: absolute;
    }
    &:hover:before {
        @include opacity(1);
        @include fill-width-height(100%, 100%);
    }
    &.button--hold:before {
        @include fill-width-height(95%, 95%);
        @include transition-duration(0.1s);
        @include transition-timing-function(cubic-bezier(0, 0, 0, 1));
        @include opacity(.9);
    }
    &:hover:after {
        @include fill-width-height(180%, 180%);
        @include opacity(0);
    }
    &.button--click:after {
        @include animation(pulsate 0.4s ease-out 1);
    }
    span {
        @include font("Source Sans Pro", normal, 100);
        text-transform: uppercase;
        position: absolute;
        @include centre(x);
        bottom: -2em;
        @include transition-property(opacity);
        @include transition-duration(0.3s);
        @include transition-timing-function(ease-out);
    }
}
              
            
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JS

              
                
              
            
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