html,
body {
    position: relative;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

#main {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

body.has-code {
    background: #eee;
}
.has-code #code-box {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 290px;
    margin: 0;
    border: 3px solid #aaa;
    overflow: auto;
}
.has-code #code-area {
    position: absolute;
    left: 0;
    padding: 10px;
    top: 0;
    bottom: 0;
    width: 500px;
}
.has-code #main {
    left: 300px;
    user-select: none;
    -webkit-user-select: none;
}

.stage-control-toolbar {
    position: absolute;
    z-index: 10000;
    bottom: 50px;
    left: 0;
    right: 0;
    height: 60px;

    text-align: center;
}
.stage-control-toolbar button {
    float: left;
    margin-top: 10px;

    border-radius: 5px;
    font-size: 20px;
    color: #fff;
    background: none;
    border: 1px solid #fff;
    margin-left: 10px;
    padding: 5px;

    cursor: pointer;
}