body {
    background-color: #222; display: flex; flex-direction: column; align-items: center;
}
canvas {
    border: 1px solid black;
    background-color: #1a1a1a;
}
#controls, #planeList {
    margin-top: 10px;
    font-family: Arial, sans-serif;
    color: #fff;
    background-color: #333;
    padding: 10px;
    border-radius: 5px;
    width: 600px;
}
#planeList {
    max-height: 200px;
    overflow-y: auto;
}
#score, #message {
    margin: 5px 0;
}
#planeList ul {
    list-style: none;
    padding: 0;
}
#planeList li {
    cursor: pointer;
    margin: 5px 0;
    padding: 5px;
}
#planeList li:hover {
    background-color: #555;
}
#planeList li.selected {
    background-color: #555;
    color: #fff;
}
#planeList .plane-id {
    text-decoration: underline;
    color: #0af;
    cursor: pointer;
}