#interContainer {
    position: absolute;
    width: 600px; /*Width of interstitial box*/
    left: 0;
    top: 0;
    padding: 15px;
    padding-top: 0;
    background-color: #dddddd;
    border: 1px solid black;
    visibility: hidden;
    z-index: 6;
}

    #interContainer .headerbar { /*CSS for header bar of interstitial box*/
        color: blue;
        padding: 5px 0;
        text-align: right;
    }

        #interContainer .headerbar a { /*CSS for header bar links of interstitial box*/
            font-size: 120%;
            text-decoration: none;
        }

#interContent { /*CSS for div that holds the content to show*/
    border: 1px solid gray;
    text-align: center;
    background-color: white;
    padding: 10px 10px;
}

#interVeil { /*CSS for background veil that covers entire page while interstitial box is visible*/
    position: absolute;
    background: black url(/_layouts/15/SPWET4/PhoenixSurvey/blackdot.gif);
    right: 0;
    width: 10px;
    top: 0;
    z-index: 5;
    visibility: hidden;
    filter: progid:DXImageTransform.Microsoft.alpha(opacity=80);
    opacity: 0.5;
}