p{
text-indent: 2em;


}



.a{color:red;}
text-align:center;}

     * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        /* 导航容器 - 撑满屏幕宽度 */
        .nav {
            background-color: #04AA6D;
            width: 100%;
        }
        /* 导航列表 - flex 布局 */
        .nav ul {
            list-style: none;
            display: flex;
            width: 100%;
        }
        /* 导航项 - 均分宽度 */
        .nav li {
            flex: 1;
            text-align: center;
        }
        .nav a {
            display: block;
            color: white;
            padding: 14px 0;
            text-decoration: none;
        }
        .nav a:hover {
            background-color: #rrr;
            color: black;
        }
        .nav a.active {
            background-color: #04AA6D;
        }


#bg{background-image: url("../photos/bj.jpg");
		background-repeat: no-repeat;
		background-size: cover;
		background-attachment: fixed;
                background-position: center}