.collapse{display:none}
.collapse.in{display:block}
.collapsing{
    position:relative;
    height:0;
    overflow:hidden;
    -webkit-transition-property:height, visibility;
    -o-transition-property:height, visibility;
    transition-property:height, visibility;
    -webkit-transition-duration:.35s;
    -o-transition-duration:.35s;
    transition-duration:.35s;
    -webkit-transition-timing-function:ease;
    -o-transition-timing-function:ease;
    transition-timing-function:ease;
}
.show{display:block !important}