.button {
    width: 50px;
    height: 50px;
    border: 1px solid black;
}

div {
    display:inline;
    margin-left: 10px;
    margin-right:10px;
}

.canvas {
    border:1px solid #000000;
}

html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    overflow: hidden;
    display: block;
}