body {
    background: #050509;
    color: white;
    font-family: Arial;
    text-align: center;
}

h1 {
    margin: 30px;
    letter-spacing: 4px;
}

#score, #timer {
    font-size: 22px;
    margin: 10px;
}

#alien {
    font-size: 70px;
    margin: 20px;
}

#signal {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 25px;
}

#signal div {
    width: 45px;
    height: 45px;
    border-radius: 8px;
}

button {
    width: 60px;
    height: 60px;
    margin: 5px;
    border: 0;
    border-radius: 10px;
    color: white;
    font-size: 20px;
}

button:nth-child(1) { background: green; }
button:nth-child(2) { background: blue; }
button:nth-child(3) { background: purple; }
button:nth-child(4) { background: gold; }

#message {
    color: #aaa;
    margin: 25px;
}