#container {
    overflow: hidden;
    width: 100%;
    height: 100%;
    margin: 0;
    font-family: "微软雅黑";
}
ul li {
    list-style: none;
}
.btn-wrap {
    z-index: 999;
    position: fixed;
    bottom: 3.5rem;
    margin-left: 3rem;
    padding: 1rem 1rem;
    border-radius: .25rem;
    background-color: #fff;
    box-shadow: 0 2px 6px 0 rgba(27, 142, 236, 0.5);
}
.btn {
    width: 100px;
    height: 30px;
    float: left;
    background-color: #fff;
    color: rgba(27, 142, 236, 1);
    font-size: 14px;
    border:1px solid rgba(27, 142, 236, 1);
    border-radius: 5px;
    margin: 0 5px;
    text-align: center;
    line-height: 30px;
}
.btn:hover {
    background-color: rgba(27, 142, 236, 0.8);
    color: #fff;
}