#customService {
    position: fixed;
    right: 30px;
    bottom: 100px;
    width: 50px;
    height: 50px;
    background-color: var(--main-color-one);
    color: #fff;
    text-align: center;
    line-height: 53px;
    border-radius: 50%;
    z-index: 99;
    font-size: 25px;
    cursor: pointer;
    box-shadow: 0 0 5px rgba(0, 0, 0, .5);
}

#customService:hover {
    box-shadow: 0 0 20px 2px #918f8f;
    /*盒子阴影*/
    transition: all 0.5s;
    /*持续时间*/
    /* background-color: aqua; */
}