.tabs {
position: relative;
}
.tab {
float: left;
}
.tab-label {
display: inline-block;
}
.tab-content {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
-ms-box-sizing: border-box;
box-sizing: border-box;
display: none;
position: absolute;
top: 0;
left: 0;
width: 100%; 
}
.tab.active .tab-content {
display: block;
}