html, body {
    height: 100%;
}

body {
    background-color: #2A2A2A;
}

header {
    background-color: #3E3F40;
    height: 40px;
}

header h2, section h3 {
    display: none;
}

header ul {
    position: absolute;
    top: 0;
}

header ul#files {
    position: absolute;
    right: 0;
    top: 0;
}

header ul li {
    display: inline;
}



section#main {
    position: absolute;
    left: 0;
    top: 50px;
    right: 0;
    bottom: 0;
    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%;
}