.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 10vh auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    max-height: 80vh;
    text-align: center;
    overflow-y: auto;
    scrollbar-width: none;  /* 用于 Firefox */
    -ms-overflow-style: none;  /* 用于 Internet Explorer 和 Edge */
}

.modal-content::-webkit-scrollbar {
    display: none;  /* 用于 Chrome, Safari 和 Opera */
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}