#code {
    margin: 0;
    font-family: "Courier New", Courier, monospace;
    font-size: 15px;
    height: 50vh;
}
#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #222;
    color: #0f0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: monospace;
    z-index: 999;
}
#loading.hidden {
    display: none;
}