body {
    margin: 0;
    background-color: #87ceeb; /* sky */
    font-family: sans-serif;
}

#game {
    position: relative;
    width: 800px;
    height: 400px;
    margin: 20px auto;
    border: 2px solid black;
    overflow: hidden;
    background-color: #a0ffa0; /* arena ground background */
}

#floor {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 50px;
    background-color: #654321; /* floor color */
}

.player {
    width: 50px;
    height: 50px;
    position: absolute;
}
button {
    cursor: pointer;
    border: none;
    color: black;
    font-weight: bold;
}