html, body, #ComposeTarget {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    overscroll-behavior: none;
    background: #ffffff;
    color: transparent;
    font-size: 0;
    touch-action: none;
}

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