html, body {
    height: 100%;
}

body {
    background-color: #1E1E1E;
}

section#main {
    position: relative;
    width: 100%;
    height: 100%;
    line-height: 100%;
    text-align: center;
}

canvas#editor {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
    max-width: 100%;
    max-height: 100%;
}