body {
    margin: 0;
    padding: 0;
    font-family: "明朝体", serif;
    background-image: url('moon.jpg');
    background-size: cover;
    background-position: center;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background-color: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

#coinDisplay, #resultDisplay {
    margin-top: 20px;
    font-size: 1.5rem;
}

#startButton {
    font-size: 1.5rem;
    padding: 10px 20px;
    cursor: pointer;
}