html {
    width: 100%;
    height: 100%;
}
body {
    background-color: #efefef;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --control-panel-size: 400px;
}
.container {
    width: 100%;
    position: relative;
}
.container .scene-container {
    width: 100%;
}
.container .scene-container canvas {
    border: 1px solid black;
    box-sizing: content-box;
    width: 100%;
    height: 100%;
}
.container .control-panel-container {
    position: absolute;
    top: 16px;
    right: 16px;
    width: var(--control-panel-size);
}
.container .stopwatch-panel-container {
    position: absolute;
    top: 16px;
    left: 16px;
}