/* Close Button */
.close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255,255,255,0.9);
    border: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    line-height: 26px;
    z-index:99;
}

    .close-btn:hover {
        background: #f44336;
        color: #fff;
    }