radio button active change

HTML

<div class="tab">
       <input type="radio" id="tab-1" name="tab-group-1" checked>
       <label for="tab-1">Tab One</label>

       <div class="content">
           tab#1
       </div> 
   </div>

   <div class="tab">
       <input type="radio" id="tab-2" name="tab-group-1">
       <label for="tab-2">Tab Two</label>

       <div class="content orange">
           tab#2
       </div> 
   </div>

    <div class="tab">
       <input type="radio" id="tab-3" name="tab-group-1">
       <label for="tab-3">Tab Three</label>

       <div class="content black">
           tab#3
       </div> 
   </div>

CSS

.tabs {
  position: relative;   
  height: 200px; /* This part sucks */
  clear: both;
  margin: 25px 0;
}
.tab {
  float: left;

}
.tab label {
  background: #eee; 
  padding: 10px; 
  border: 1px solid #ccc; 
  margin-left: -1px; 
  position: relative;
  left: 1px; 
}
.tab [type=radio] {
  display: none;
}
.content {
  position: absolute;
  top: 28px;
  left: 0;
  background: white;
  right: 0;
  bottom: 0;
  padding: 20px;
  border: 1px solid #ccc; 
}

[type=radio]:checked  {
}

[type=radio]:checked ~ .content {
}

.black {
    background: black;
    color: #fff;
}

.orange {
    background: #ff7200;
}