.zoomed{
    margin-left: 4em;
}

.original, .zoomed{
    float: left;
    position: relative;
    overflow: hidden;
}


.original img{
    max-height: 300px;
    width: auto;
}

.zoomed img{
    height: 600px;
    position: relative;
}

.mark {
    opacity: .3;
    border: 6px dotted #fff;
    background: #eee;
}

.hide {
    visibility: hidden;
}