.pc-tab > input,
.pc-tab section > div {
  display: none;
}

#tab1:checked ~ section .tab1,
#tab2:checked ~ section .tab2,
#tab3:checked ~ section .tab3 {
  display: block;
}

#tab1:checked ~ nav .tab1,
#tab2:checked ~ nav .tab2,
#tab3:checked ~ nav .tab3 {
  color: red;
}

/* Visual Styles */
*,
*:after,
*:before {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

.pc-tab {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
}
.pc-tab ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.pc-tab ul li label {
  float: left;
  padding: 15px 25px;
  border: 1px solid #ddd;
  border-bottom: 0;
  background: #eeeeee;
  
}
.pc-tab ul li label:hover {
  background: #dddddd;
}
.pc-tab ul li label:active {
  background: #ffffff;
}
.pc-tab ul li:not(:last-child) label {
  border-right-width: 0;
}
.pc-tab section {
  
  clear: both;
}
.pc-tab section div {
  padding: 20px;
  width: 100%;
  border: 1px solid #ddd;
  background: #fff;
  line-height: 1.5em;
  letter-spacing: 0.3px;
  color: #444;
  height: 200px;
  overflow: auto;
}
.pc-tab section div h1,h2,h3 {
  margin: 0;
}

#tab1:checked ~ nav .tab1 label,
#tab2:checked ~ nav .tab2 label,
#tab3:checked ~ nav .tab3 label {
  background: white;
  color: #111;
  position: relative;
}
#tab1:checked ~ nav .tab1 label:after,
#tab2:checked ~ nav .tab2 label:after,
#tab3:checked ~ nav .tab3 label:after {
  content: "";
  display: block;
  position: absolute;
  height: 2px;
  width: 100%;
  left: 0;
  bottom: -1px;
}