#popup_main {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    max-width: 100%;
    background-color: #fff;
    border: 1px solid #ccc;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    z-index: 9999;
}

#popup-header {
    text-align: center;
    padding: 10px;
    border-bottom: 1px solid #ccc;
    font-size: 21px;
    color: #f00;
    font-weight: bold;
}

#popup-content {
    text-align: left;
    padding: 50px 10px; /* 上下 20px，左右 10px 的 padding */
    overflow-wrap: break-word;
    line-height: 150%;
}

#close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    cursor: pointer;
}