html:not(.ms-dialog) body:not(.ad-login) #s4-workspace {
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    background-position: center 100px;
    background-size: 100vw !important;
}
html:not(.ms-dialog) body:not(.ad-login) #s4-workspace #s4-bodyContainer {
    min-height: 100%;
    background-image: linear-gradient(rgba(255, 255, 255,0), rgba(255, 255, 255,1),rgba(255, 255, 255,1));
    background-image: -webkit-gradient(linear, left top, left 750, from(rgba(31, 77, 130, 0)), to(rgba(255, 255, 255, 1)));
}

html:not(.ms-dialog) .ad-login #s4-workspace
{
    background-position: center top !important;
    background-size: cover !important;
}

html:not(.ms-dialog) #s4-bodyContainer,
html .ad-login #s4-bodyContainer
{
    background-color: rgba(255,255,255,.75);
}