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

html, body {
    width: 100%;
    height: 100%;
    background-color: #F7F7F2;
    overflow: hidden;
}

#arena {
    display: block;
    width: 100%;
    height: 100%;
    margin-left: auto;
    cursor: none;
}