body {
    font-family: Arial, sans-serif;
    text-align: center;
    background: #f0f0f0;
    margin: 0;
    padding: 0;
}
header, footer {
    background: #333;
    color: white;
    padding: 10px 0;
}
main {
    padding: 20px;
}
.cps-button {
    font-size: 24px;
    padding: 20px 40px;
    margin: 20px 0;
    cursor: pointer;
}
.score {
    font-size: 20px;
    margin-top: 10px;
}
.ad-slot {
    margin: 20px auto;
    width: 300px;
    height: 250px;
    background: #ccc;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    font-weight: bold;
    border: 2px dashed #999;
}