body {
    margin: 0;
    padding: 0;
    background-color: #242424;
}

/* include border and padding in element width and height */
* {
    box-sizing: border-box;
}

/* full-sized  container that fills up the page */
#viewer {
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    display: block;
}

/* Make loading text appear on the screen */
div:not(.online_3d_viewer) {
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 2em;
    font-weight: bold;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

/* Loading Screen CSS */
#loading-screen {
    position: absolute;
    z-index: 2;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #242424;
    opacity: 1;
    transition: 1s opacity;
}

#loading-screen.fade-out {
    opacity: 0;
}

#number {
    display: none;
}

#loader {
    display: block;
    position: relative;
    left: 50%;
    top: 50%;
    width: 150px;
    height: 150px;
    margin: -75px 0 0 -75px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #242424;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
}
#loader:before {
    content: "";
    position: absolute;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #bb0000;
    -webkit-animation: spin 3s linear infinite;
    animation: spin 3s linear infinite;
}
#loader:after {
    content: "";
    position: absolute;
    top: 15px;
    left: 15px;
    right: 15px;
    bottom: 15px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #666666;
    -webkit-animation: spin 1.5s linear infinite;
    animation: spin 1.5s linear infinite;
}
@-webkit-keyframes spin {
    0%   {
        -webkit-transform: rotate(0deg);
        -ms-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(360deg);
        -ms-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}
@keyframes spin {
    0%   {
        -webkit-transform: rotate(0deg);
        -ms-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(360deg);
        -ms-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}