#floating-ad {
    position: fixed;
    width: 200px;
    height: 100px;
    background-color: transparent;
    border: none;
    cursor: default;
    z-index: 9999;
    box-shadow: none;
    transition: none;
    overflow: hidden; /* 隐藏溢出 */
    display: none;
}

#floating-ad img {
    width: 200px;
    height: auto;
    border-radius: 5px;
    cursor: pointer;
}

#close-ad {
    position: absolute;
    top: 5px;
    right: 5px;
    width: 20px;
    height: 20px;
    background-color: rgba(255,255,255,0.8);
    border-radius: 50%;
    color: #333;
    font-size: 14px;
    font-weight: bold;
    text-align: center;
    line-height: 20px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s ease;
}

#floating-ad:hover #close-ad {
    opacity: 1;
}