<div class="checks">
					  <input type="radio" id="ex_rd" name="ex_rds"> 
					  <label for="ex_rd">라디오버튼</label> 
					</div>

<br>

<div class="checks small">
					  <input type="radio" id="ex_rd2" name="ex_rds"> 
					  <label for="ex_rd2">라디오버튼</label> 
					</div>

<a href="http://webdir.tistory.com/433" target="_blank" class="where">posted in webdir</a> 

body {margin: 10px; font-size: 13px}
.where {
  display: block;
  margin: 25px 15px;
  font-size: 11px;
  color: #000;
  text-decoration: none;
  font-family: verdana;
  font-style: italic;
} 

.checks {position: relative;}
.checks input[type="radio"] {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip:rect(0,0,0,0);
  border: 0;
}
.checks input[type="radio"] + label {
  display: inline-block;
  position: relative;
  padding-left: 30px;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}
.checks input[type="radio"] + label:before {
  content: '';
  position: absolute;
  left: 0;
  top: -4px;
  width: 21px;
  height: 21px;
  text-align: center;
  background: #fafafa;
  border: 1px solid #cacece;
  border-radius: 100%;
  box-shadow: 0px 1px 2px rgba(0,0,0,0.05), inset 0px -15px 10px -12px rgba(0,0,0,0.05);
}
.checks input[type="radio"] + label:active:before,
.checks input[type="radio"]:checked + label:active:before  {
  box-shadow: 0 1px 2px rgba(0,0,0,0.05), inset 0px 1px 3px rgba(0,0,0,0.1);
}
.checks input[type="radio"]:checked + label:before {
  background: #E9ECEE;
  border-color: #adb8c0;
}
.checks input[type="radio"]:checked + label:after {
  content: '';
  position: absolute;
  top: 1px;
  left: 5px;
  width: 13px;
  height: 13px;
  background: #99a1a7;
  border-radius: 100%;
  box-shadow: inset 0px 0px 10px rgba(0,0,0,0.3);
}

/* radio size */
.checks.small input[type="radio"] + label {
  font-size: 12px;
  padding-left: 25px;
}
.checks.small input[type="radio"] + label:before {
	top: -2px;
  width: 17px;
  height: 17px;
}
.checks.small input[type="radio"]:checked + label:after {
	top: 3px;
  width: 9px;
  height: 9px;
}