.content {
    width:100%;
    height:auto;
}
.clearfix:before,.clearfix:after {
        content: "";
        display: block;
        clear: both;
}

.clearfix {
    zoom: 1;
}
.pifu {
    background:rgba(68, 141, 232,1);
}
.pifu:hover{
      -webkit-transition: .5s;
    -moz-transition: .5s;
    -o-transition: .5s;
    transition: .5s;
     background:rgba(68, 141, 232,.8)
}