body {
    font-family: system-ui, sans-serif;
    background-color: #1a1a1a;
    color: #ffffff;
    text-align: center;
    padding-top: 50px;
}
button {
    background-color: #00ff00;
    color: #000;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
    margin-top: 20px;
}
#counter {
    margin-top: 20px;
    padding: 20px;
    border: 1px solid #333;
    display: inline-block;
    border-radius: 8px;
}