#ui_loginMask {
    background-color: #000;
    opacity: 0.3;
    width: 100%;
    height: 100%;
    display: inline-block;
    position: absolute;
    z-index: 10;
}

#ui_login {
    top: 50%;
    left: 50%;
    margin-left: -170px;
    margin-top: -120px;
    width: 340px;
    padding: 20px;
    background-color: #efefef;
    position: absolute;
    display: inline-block;
    z-index: 20;
}

#myContainer {
    height: 600px;
    position: relative;
    background: white;
}

#myAnimation {
    width: 1920px;
    height: 1600px;
    position: absolute;
    background: red;
}