#side-banner #closebtn {
    position: absolute;
    top: 0px;
    right: 0px;
    z-index: 1;
    width: 20px;
    height: 20px;
    background-color: #ffffff;
    border: 1px solid rgb(0, 157, 255);
    color: rgb(0, 157, 255);
    line-height: 20px;
    text-align: center;
    cursor: pointer;
}