* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}


li {
	list-style: none;
}

a {
	text-decoration: none;
}

body {
	font-family: Arial, sans-serif;
	background-color: #f4f4f4;
    display: flex;
    flex-direction: column; /* 子元素垂直排列 */
    justify-content: center; /* 垂直方向居中 */
    align-items: center;     /* 水平方向居中 */
    min-height: 100vh;       /* 让body占满整个视口高度 */
    padding: 20px;
}

.beian {
    color: #333;
    transition: all .2s ease;
}

.beian-icon {
    position: relative;
    top: 4px;
}

.beian:hover {
    color: dodgerblue;
    transition: all .2s ease;
}

footer {
    margin-top: 50px;
}