* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body,
html {
    width: 100%;
    height: 100%;
    background-color: #000;
    overflow: hidden;
    cursor: grab;
}

body:active,
html:active {
    cursor: grabbing;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}