html,body{
  height: 100%;
  margin: 0;
  padding: 0;
  background-color: #58596b;
}
.container{
  width: 800px;
  height: 400px;
  margin: 100px auto;
  background-color: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,.1);
}
.tab-wrapper{
  position: relative;
  width: 800px;
  height: 60px;
  background-color: #33344a;
}

.tab-wrapper .tab-radio{
  display: none;
}

.tab-handler{
  position: relative;
  z-index: 2;
  display: block;
  float: left;
  height: 60px;
  padding: 0 40px;
  color: #717181;
  font-size: 16px;
  line-height: 60px;
  transition: .3s;
  transform: scale(.9);
}

.tab-radio:checked + .tab-handler{
  color: #fff;
  background-color: #e74c3c;
  transform: scale(1);
}
.tab-radio:checked + .tab-handler + .tab-content{
  visibility: visible;
  opacity: 1;
  transform: scale(1);
}

.tab-wrapper .tab-content{
  visibility: hidden;
  position: absolute;
  top: 60px;
  left: 0;
  width: 740px;
  padding: 30px;
  color: #999;
  font-size: 14px;
  line-height: 1.618em;
  background-color: #fff;
  opacity: 0;
  transition: transform .5s, opacity .7s;
  transform: translateY(20px);
}