.tabbar{
  position:fixed; left:0; right:0; bottom:0;
  pointer-events:none; z-index:9999;
}
.tabbar .tab-bg{
  display:block;
  width:100%; 
  height:auto; 
}
.tab{position:absolute; bottom:18%; width:18%; height:36%; pointer-events:auto}
.t1{left:7%} .t2{left:27%} .t3{left:45%; width:10%; height:52%} .t4{left:60%} .t5{left:79%}