about区的一些问题
*{
margin:0;
padding:0;
font-family:"Microsoft YaHei UI";
}
.head{
width: 100%;
height:100px;
background-color:#07cbc9;
position:fixed;
z-index: 4;
}
.head img{
margin-left: 100px;
padding-top:20px;
}
.head .nav{
float:right;
}
.head .nav ul{
padding-right: 100px;
}
.head .nav ul li {
width: 100px;
height: 100px;
line-height: 100px;
display: inline-block;
font-weight: bolder;
color: white;
font-size: 20px;
text-align: center;
}
.nav li:hover{
background-color: #000000;
color: #ffffff;
}
.banner{
width:100%;
}
.banner img{
width:100%;
height:800px;
}
.banner .veil{
position:absolute;
top:100px;
left:0px;
background-color: #000;
width:100%;
height:700px;
opacity:0.5;
}
.banner .information{
position:absolute;
z-index: 2;
width:504px;
height:300px;
top:400px;
left:50%;
margin-left: -250px;
margin-top:-150px;
}
.banner .information input,textarea{
background-color: transparent;
display: block;
border: 2px solid white;
font-family: Microsoft YaHei UI;
width: 500px;
height: 40px;
margin-top:30px;
}
.banner .information textarea{
height:100px;
overflow: hidden;
}
.banner .information button{
background-color: transparent;
width:150px;
height:40px;
border: 2px solid white;
font-family: Microsoft YaHei UI;
margin-left:170px;
margin-top:30px;
color: white;
line-height: 40px;
}
.banner .information input:hover{
border:2px solid #07cbc9;
}
.banner .information textarea:hover{
border:2px solid #07cbc9;
}
.banner .information button:hover{
background-color: #07cbc9;
border-color: #07cbc9;
cursor: pointer;
}
.about .title{
font-size:30px;
color:#000;
width: 100%;
height:80px;
line-height: 80px;
text-align:center;
font-weight: bolder;
}
.about hr{
border:0;
background-color: #07cbc9;
height:2px;
width: 30px;
}
.about .about-top{
font-size: 15px;
color:grey;
width:100%;
text-align: center;
height: 80px;
padding-top:10px;
}
.about .about-middle{
width:800px;
padding:0 200px 0 200px;
margin:0 350px;
height: 450px;
}
.about .about-middle img{
width: 100%;
height: 450px;
}
.about .about-middle .left{
width:200px;
height:150px;
color:#000;
font-size:30px;
text-align: center;
position:relative;
float: left;
margin-top:-450px;
left:-200px;
}
.about .about-middle .right{
width: 200px;
height:400px;
color:#000;
font-size:30px;
line-height: 50px;
text-align:center;
position:relative;
float:right;
margin-top:-450px;
right:-200px;
}
.about .about-middle .right span{
font-size: 20px;
}
.about .about-middle .right .top{
width:200px;
height:130px;
border: #07cbc9 solid 2px;
margin-left:40px;
padding-top:15px;
}
.about .about-middle .right .bottom{
width:200px;
height:130px;
border: #07cbc9 solid 2px;
margin-top: 50px;
margin-left:40px;
padding-top:15px;
}
.about .about-middle .left-bottom{
width:300px;
height:250px;
opacity: 0.5;
z-index:2 ;
position: absolute;
margin-top: -300px;
margin-left:-200px;
border:solid grey 1px;
color:#000;
font-size: 17px;
background-color:white;
}
.about .about-middle .left-bottom p{
width:250px;
height: 130px;
margin:30px 30px;
z-index: 3;
position: absolute;
}
.about .about-middle button{
width:120px;
height:50px;
margin-top:-120px;
margin-left:-170px;
cursor: pointer;
background-color: #000;
color: white;
border:0px;
font-weight: bold;
z-index: 3;
position: absolute;
}
.about .about-middle button:hover{
background-color:white;
color: black;
border:3px solid #000;
font-weight: bold;
z-index: 3;
}
.about .blank{
width:100%;
height:100px;
border: 1px solid black;
}
.about .about-bottom .div1,.div2,.div3,.div4,.div5,.div6,.div7,.div8{
width:25%;
height:300px;
}老师这是我css部分的代码，
<!DOCTYPE html>
<html>
<head>
<title>网页布局</title>
<meta charset="utf-8">
<link rel="stylesheet" type="text/css" href="exercise.css">
</head>
<body>
<!--顶部-->
<div class="head">
<div class="logo"></div>
<img src="picture/images/logo.png">
<div class="nav">
<ul>
<a href=""><li>home</li></a>
<a href=""><li>about</li></a>
<a href=""><li>gallery</li></a>
<a href=""><li>faculty</li></a>
<a href=""><li>events</li></a>
<a href=""><li>contact</li></a>
</ul>
</div>
</div>
<!--banner区-->
<div class="banner">
<img src="picture/images/banner3.jpg">
<div class="veil"></div>
<div class="information">
<form>
<input type="text" name="uername" maxlength="6" placeholder="your name" style-color="#fff">
<input type="text" name="userphone" maxlength="10" placeholder="your phone">
<input type="text" name="useremail" maxlength="10" placeholder="your email">
<textarea name="area" placeholder="Write Your Comment Here"></textarea>
<button>SEND MESSAGE</button>
</form>
</div>
</div>
<!--about区-->
<div class="about">
<div class="title">ABOUT</div>
<hr>
<div class="about-top">Lorem Ipsum is simply dummy text of the printing and typeseting <br>industry.Lorem Ipsum has been the industry's standard dummy <br>text ever since the 1500s.
</div>
<div class="about-middle">
<div><img src="picture/images/bb3.jpg"></div>
<div class="left">A WORD<br> ABOUT US</div>
<div class="right">
<div class="top">70000<hr><span>Students</span></div>
<div class="bottom">600<hr><span>Faculty</span></div>
</div>
<div class="left-bottom">
<p class="word"> Praesent dignissim viverra est,sed bibendum ligula congue non.Sed ac nislet felis gravida commodo?Suspendisse edgt ullamcorper ipsum.Suspendisse diam amet.</p>
</div>
<button>EXPLORE</button>
<div class="blank"></div>
<div class="about-bottom">
<div class="div1"><img src="picture/images/b1.jpg"></div>
<div class="div2">
<div class="word2">
<h3>Library</h3>
<p class="p1">Lorem Ipsum is simply dummy text of the printing and typesetting industry</p>
<p class="p2">Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,when an unknown printer took a gallery of type and scrambled it to make a type specimen book.</p>
</div>
<button>EXPLORE</button>
</div>
<div class="div3"><img src="picture/images/b2.jpg"></div>
<div class="div4">
<div class="word4">
<h3>Computer Lab</h3>
<p class="p1">Lorem Ipsum is simply dummy text of the printing and typesetting industry</p>
<p class="p2">Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,when an unknown printer took a gallery of type and scrambled it to make a type specimen book.</p>
</div>
<button>EXPLORE</button>
</div>
<div class="div5">
<div class="word5">
<h3>Conference Hall</h3>
<p class="p1">Lorem Ipsum is simply dummy text of the printing and typesetting industry</p>
<p class="p2">Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,when an unknown printer took a gallery of type and scrambled it to make a type specimen book.</p>
</div>
<button>EXPLORE</button>
</div>
<div class="div6"><img src="picture/images/b3.jpg"></div>
<div class="div7">
<div class="word7">
<h3>Play Ground</h3>
<p class="p1">Lorem Ipsum is simply dummy text of the printing and typesetting industry</p>
<p class="p2">Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,when an unknown printer took a gallery of type and scrambled it to make a type specimen book.</p>
</div>
<button>EXPLORE</button>
</div>
<div class="div8"><img src="picture/images/b4.jpg"></div>
</div>
</div>
</div>
</body>
</html>
这是我HTML的代码， 请问为什么在about区，我写下面那部分时，我设置了.about .about-bottom 宽度为100%，但网页里面它不是占满了整个屏幕宽度的100%，而是占满了上面about .about-middle 的100%，请问我需要怎么修改。
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