Edit in JSFiddle

<input type="radio" id="option1" name="test" value="option1" checked="checked">
<label for="option1">옵션 1</label>
<input type="radio" id="option2" name="test" value="option2">
<label for="option2" >옵션 2</label>
<input type="radio" id="option3" name="test" value="option3">
<label for="option3">옵션 3</label>

/* custom radio button */
input[type=radio]{
	width: 0;
  height: 0;
  position: absolute;
  left: -9999px;
}
input[type=radio] + label{
  margin: 0;
  padding: .75em 1.5em;
  box-sizing: border-box;
  position: relative;
  display: inline-block;
  border: solid 1px #DDD;
  background-color: #FFF;
  line-height: 140%;
  text-align: center;
  box-shadow: 0 0 0 rgba(255, 255, 255, 0);
  transition: border-color .15s ease-out,  color .25s ease-out,  background-color .15s ease-out, box-shadow .15s ease-out;
  cursor: pointer;
}
input[type=radio]:checked + label{
	background-color: #4B9DEA;
  color: #FFF;
  box-shadow: 0 0 10px rgba(102, 179, 251, 0.5);
  border-color: #4B9DEA;
  z-index: 1;
}