<body>
  <div class="center">
    <p>
      <input type="checkbox" name="A" class="a"/>
      <input type="checkbox" name="B" class="b"/>
      <input type="checkbox" name="C" class="c"/>
    </p>
  </div>
</body>
body { 
  background: url('http://kevinchassagne.com/assets/images/template/sidebar.png'); 
}

.center {
  margin: 0 auto;
  width: 50%;
}

.center input[type="checkbox"] {
  position: relative;
  display: inline-block;
  min-height: 170px;
  width: 30%;
  background: #ebebeb;
  -webkit-appearance: none;
  -moz-appearance: none;
  -o-appearance: none;
  appearance: none;
}

.center input[type="checkbox"]:after { 
  content: ''; 
  font-size: 2em;
  text-align: center;
  line-height: 70px;
  color: #555555;
  position: absolute;
  margin: auto auto;
  left: 0; right: 0; bottom: 0; top: 0;
  display: block;
  height: 70px;
  width: 70px;
  border-radius: 50%;
  background-image: none;
  background-repeat: no-repeat;
  background-position: center;
  background-color: #ffffff;
  -webkit-transition: all 0.3s ease-out;
  -moz-transition: all 0.3s ease-out;
  -ms-transition: all 0.3s ease-out;
  -o-transition: all 0.3s ease-out;
  transition: all 0.3s ease-out;
 }

.center input[type="checkbox"]:before { 
  position: absolute;
  margin: auto auto;
  left: 0; right: 0; bottom: 0; top: 0;
  content: '';
  display: block; 
  height: 80px;
  width: 80px;
  border: 2px solid #fff;
  border-radius: 50%;
  -webkit-transition: all 0.1s ease-in;
  -moz-transition: all 0.1s ease-in;
  -ms-transition: all 0.1s ease-in;
  -o-transition: all 0.1s ease-in;
  transition: all 0.1s ease-in;
}

.center input[type="checkbox"]:hover:before {
  height: 60px;
  width: 60px;
}

.center input[type="checkbox"]:checked:before {
  height: 100%;
  width: 100%;
  background: #dd3455;
  border: none;
  border-radius: 0;
}

.center input[type="checkbox"]:focus {
  outline: none;
}

.center input[type="checkbox"].a:after { content: 'A'; } 
.center input[type="checkbox"].b:after { content: 'B'; }
.center input[type="checkbox"].c:after { content: 'C'; }


.center input[type="checkbox"]:checked:after { content: '✓'; } 

External CSS

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External JavaScript

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