* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;

    display: flex;
    align-items: center;
    justify-content: center;

    background: #111;
    color: #eee;

    font-family: Arial, sans-serif;
}

.synth {
    width: 500px;
    padding: 40px;

    background: #222;
    border: 1px solid #444;
    border-radius: 12px;

    text-align: center;
}

h1 {
    margin: 0 0 30px;
    letter-spacing: 4px;
}

button {
    padding: 14px 28px;

    border: none;
    border-radius: 6px;

    background: #ddd;
    color: #111;

    font-weight: bold;
    cursor: pointer;
}

button:hover {
    background: #fff;
}

#status {
    margin-top: 20px;
    color: #aaa;
}