#evpreview {
        width: 70%;
        height: 450px;
        position: absolute;
        border: 1px solid #c0c0c0;
        background: white;
        padding: 10px;
        z-index: 5;
}
#evprevcontent {
        overflow-y: auto;
	height: 88%;
}
#evback {
        background-color: black;
        opacity: 0.8;
        display: none;
        width: 100%;  
        height: 100%; 
        position: fixed;
        left: 0;
        top: 0; 
}