body {
    background: black;
    margin: 0;
}
.loading {
    position: absolute;
    /* loading icon size: 64x64 */
    top: calc(50% - 32px);
    left: calc(50% - 32px);
}
.controls {
    position: fixed;
    top: 0;
    left:0;
    background: grey;
}
#canvas-wrapper {
    margin-left: 0;
    margin-right: 0;
    text-align: center;
    background: black;
}
.back-to-button {
    display: inline-block;
    padding: 0.5em;
    border-radius: 5px;
    color: #32A0FF;
    font-size: 20px;
    opacity: 0.8;
}
.back-to-button:hover {
    background: #f0f0f0;
    cursor: pointer;
    opacity: 1;
}
.top-bottom-buttons {
    position: fixed;
    bottom: 10px;
    right: 10px;
}

.lang-buttons {
    position: fixed;
    top: 5px;
    right: 15px;
}
.lang-buttons a {
    font-family: sans-serif;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    color: #32A0FF;
    user-select: none;
}