style.css

body,ul,ol,li,p,h1,h2,h3,h4,h5,h6,form,fieldset,table,td,img,div,dl,dt,dd,input {
    margin: 0;
    padding: 0;
}

li{
	list-style: none;
}

body{
	min-width: 1600px;
	background-color: #f5f5f5
}


/*顶部导航栏*/
.nav-bar{
	height: 60px;
	background-color: #FFFFFF;
	
}
.nav-bar .head-logo{
	float: right;
}

.nav-bar .site-logo {
	float: left;
}

.nav-bar .site-logo img{
	height: 50px;
	margin-top: 5px;
	margin-left: 5px;
}

.nav-bar .head-logo img{
	height: 50px;
	border-radius: 50%;
	margin-top: 5px;
	margin-right: 5px;
}

.nav-bar .head-logo span{
	vertical-align: top;
	line-height: 60px;
	font-size: 18px;
	font-weight: 700;
	margin-right: 10px;
}

/*介绍页面*/
.intro{
	height: 500px;
	background: url(img/bg.jpg) no-repeat;
	background-size:cover;
	text-align: center;
	margin-bottom: 30px;
}

.intro h1{
	font: 65px/5.5em "微软雅黑";
	color: #FFFFFF;
}

.intro a{
	font-size: 20px;
	text-decoration: none;
	color: #FFFFFF;
	border: 1px solid #FFFFFF;
	border-radius: 10px;
	padding: 15px;
    transition: all .2s ease-in;
    -webkit-transition: all .2s ease-in;
}

.intro a:hover{
	color: #2ba7de;
	background-color: rgba(255,255,255,.5);
}

/*任务*/
.task{
	width: 80%;
	margin: 0 auto;
	background-color: #FFFFFF;
	margin-bottom: 30px;
	overflow: auto;
}

.task .homework{
	overflow: auto;
}

.task .homework p{
	padding: 10px;
	font-size: 24px;
	border-left: 4px solid #0000FF;
	border-bottom: 2px solid #0000FF;
}

.task .homework .list li{
	text-align: center;
	float: left;
	width: 33.3%;
	height: 40px;
}

.task .homework .list a:hover{
	background-color: #0000FF;
	color: #FFFFFF;
}

.task .homework .list a{
	display: inline-block;
	width: 100%;
	height: 100%;
	line-height: 40px;
	color: #000000;
	text-decoration: none;
	transition: all .3s ease-in;
	-webkit-transition: all .2s ease-in; 
	
}

/*页尾*/
.footer{
	clear: both;
	height: 60px;
	background-color: #838383;
	color: #FFFFFF;
	text-align: center;
	line-height: 60px;
}