#iframe:hover  .over{
    opacity:1;
}
.over{
    opacity:0;
    position:absolute;
    top:9px;
    left:0px;
    background:rgba(44, 62, 80, 0.64);
    width:100%;
    height:551px;
    -o-transition:.3s;
-ms-transition:.3s;
-moz-transition:.3s ;
-webkit-transition:.3s;
transition:.3s  ;
}
#iframe{
    position:relative;
    width:100%;
 }