#overlay_load {   
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background-color: white;
    width: 100vw;
    max-width: 100vw;
    min-height: 100vh;
    max-height: 100vh;
    top: 120vh;
    left: 0;
}
#overlay_load.on_loading {
    top: 0vh;
    display: flex;
}
#overlay_load img {
    max-width:50%;
    min-width:50%;
    opacity:0;
    transition: opacity 0.8s ease-in-out;
}
#overlay_load.on_loading img {
    opacity:1;
}