body{
    margin: -2px !important;
    padding: -2px !important;
    height: 100vh;
    width: 100vw;
    position: fixed;
    background-color: black;
}

.main-section {
    height: 100%;
    width: 100%;
    position: fixed;
    background-image:
    url("/assets/images/bgthree.png"),
    url("/assets/images/bgtwo.gif"),
    linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), 
    url("/assets/images/bgone.png");

    background-position:center;
    background-size:cover;
}