/*全局样式*/
* {
    color: white;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    background-color: #333333;

}
h1, h2, h3, h4, h5, h6 {
    margin: 2rem 0 1rem;
    font-family: SmileySans, Arial, Helvetica, sans-serif;
}
ul {
    list-style: none;
}
a {
    text-decoration: none;
}