html {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
}

body {
    font-family: "ヒラギノ角ゴ ProN W6", 'Hiragino Kaku Gothic ProN W6', "ヒラギノ角ゴシック", "Hiragino Sans", "メイリオ", Meiryo, "ＭＳ Ｐゴシック", 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    background-color: #f0f0f0;
    padding: 0;
    margin: 0;
}

.game-container {
    text-align: center;
    background-color: #ffffff;
    padding-inline: 40px;
    padding-block: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.);
}

.game-area {
    margin: 10px 0;
}

#clickButton {
    padding: 15px 30px;
    font-size: 24;
    cursor: pointer;
    background-color: #4caf50;
    color: white;
    border: none;
    border-radius: 5px;
    transition: background-color 0.3s;
}

#clickButton:hover {
    background-color: #45A049;
}

#result {
    margin-top: 20px;
}

.hidden {
    display: none;
}

#ranking-container {
    display: none;
    margin-top: 30px;
}

#ranking-list {
    list-style-type: none;
    padding: 0;
}

#ranking-list li {
    background-color: #e9e9e9;
    padding: 8px;
    margin-bottom: 5px;
    border-radius: 4px;
}