body {
    /* 初始化 */
    width: 100%;
    min-width: 320px;
    max-width: 960px;
    margin: 0 auto;
    font-family: -apple-system, Helvetica, sans-serif;
    font-size: 14px;
    color: black;
    line-height: 1.5;
    background-color: #fff;
    /* margin-bottom: 20px; */
    padding-bottom: 45px;

}

* {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
    color: #222;
}

button {
    border: none;
    outline: none;
    -webkit-appearance: none;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

div {
    box-sizing: border-box;
}