.SiteUpdates_Container {
    float: left;
    padding: 0;
    margin-top: 15px;
    width: 655px;
    height: 340px;
    border: 1px solid #005587;
    background-color: white;
}

@media (max-width: 1000px) {

    .SiteUpdates_Container {
        height: 350px;
        width: 250px;
        margin-left: 10px;
    }
}

@media (max-width: 600px) {

    .SiteUpdates_Container {
        width: 100%;
        height: auto;
        float: none;
        clear: both;
        margin-left: 0;
    }
}