Edit in JSFiddle

<div class="radiobutton">
    <input type="radio" name="radio" id="some_radiobutton">
    <label for="some_radiobutton">Awesome radio button</label>
    <br>
    <input type="radio" name="radio" id="some_radiobutton2">
    <label for="some_radiobutton2">Awesome radio button 2</label>
</div>
.radiobutton input[type=radio] {
  position: absolute;
  top: -99999px;
  opacity: 0;
}
.radiobutton input[type=radio] + label {
  padding-left: 20px;
  position: relative;
}
.radiobutton input[type=radio] + label::before {
  content: '';
  display: block;
  position: absolute;
  width: 12px;
  height: 12px;
  left: 0;
  top: 0;
  border: 1px solid #999;
  background-color: #ddd;
  border-radius: 50%;
  box-shadow: inset 1px 1px 2px 0 rgba(0, 0, 0, 0.3);
}
.radiobutton input[type=radio]:checked + label::after {
  content: '';
  display: block;
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #333;
  left: 3px;
  top: 3px;
}