*{
    margin: 0;
    padding: 0;
}

.top{
    height: 60px;
    width: 100%;
}

.top_title{
    line-height: 60px;
    background-color: #45bdbb;
    color: white;
    font-weight: bold;
    text-align: center;
    letter-spacing: 4px;
    font-size: 18px;
    position: fixed;
    top: 0;
    width: 100%;
}

a{
    text-decoration: none;
}

.tips_re{
    color: red;
    font-weight: bold;
}