.top_nav{
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    z-index: 66;
    background-color: #FFF;
    box-shadow: 0 0 6px 0 rgba(255,255,255,255);
}
.tips {
    display: flex;
    color: #fff;
    height: 100px;
    align-items: center;
    justify-content: space-around;
}
.tips img {
    border-radius: 10px;
}
.middle {
    flex: 1;
    margin-left: 20px;
}