div#main_canvas_dropfile {
    display: none;
    visibility: collapse;
    position: fixed;
    overflow: hidden;
    z-index: 1002;

    left: 0;
    top: 0;
    width: 100%;
    height: 100%;

    background-color: #33002c;
    background-color: #33002ccc;
}

div#main_canvas_dropfile.dragover {
    display: block !important;
    visibility: visible !important;
}

div#main_canvas_dropfile_icon {
    opacity: 0;

    position: fixed;
    left: calc(50% - 120px);
    top: calc(50% - 120px);
    width: 240px;
    height: 240px;

    transition: 0.5s;
}

div#main_canvas_dropfile_hint {
    opacity: 0;
    color: white;

    position: fixed;
    top: 100%;
    width: 80%;
    padding: 0% 10% 0% 10%;
    font-size: xx-large;
    text-align: center;

    transition: 0.5s;
}