.ckkner {
    width: 90%;
    margin: 0 auto;
    border: 2px solid #5d5d5d;
    border-radius: 25px; 
    padding: 30px;
    box-sizing: border-box;
    display: flex; /* 关键属性 */
    gap: 0; /* 可选：控制两列之间的间距 */
}

#left, #right {
    padding: 10px;
    box-sizing: border-box;
}

#left {
    width: 72%;
}

#right {
    width: 28%;
}




.jiazhaobutton {
    margin: 1px;
    padding: 15px;
    font-size: 20px;
    color: white;
    background-color: #67affd;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    width: 55px;
    height: 55px;
}
.jiazhaobutton:hover {
    background-color: #0056b3;
}
.correct .jiazhaobutton {
    background-color: lightgreen;
}
.incorrect .jiazhaobutton {
    background-color: #ffcccc;
}
.correct { 
    color: green; 
}
.incorrect { 
    color: red; 
}



    .answer {
        position: relative;
        display: inline-block;
        margin-right: 10px;
        width: 40px;
        height: 40px;
        line-height: 50px;
        text-align: center;
        font-size: 50px;
        border: 2px solid #ccc;
        cursor: pointer;
    }
    .answer input[type="checkbox"] {
        display: none; /* 隐藏默认的复选框 */
    }
    .answer span.feedback {
        display: none;
        position: absolute;
        top: -10px;
        left: -8px;
        width: 100%;
        height: 100%;
        font-size: 1.5em;
    }
    .answer .correct {
        color: green;
    }
    .answer .incorrect {
        color: red;
    }
    .label {
        font-size: 2.5em;
        vertical-align: top;
        margin-left: 5px;
    }