遮罩层把底下的内容给遮挡了,咋整?

<!DOCTYPE html>
<html>
<head>
<title>career bulider</title>
<meta charset="utf-8">
<!-- <link rel="stylesheet" type="text/css" href="stylelist.css"> -->
<style type="text/css">
*{
padding:0;margin:0;
}
.top{
width:100%;height:100px;
background: #07cbc9;
}
.top img{
height:80px;width:auto;
text-align: left;
margin-top:10px;
float:left;
}
.top-nav ul{
float: right;
list-style-type: none;
padding-right: 20px;
}
.top-nav ul li{
height:100px;
float:left;
padding-right: 20px;
line-height: 100px;
font: 30px bold "微软雅黑";
}
.top-nav ul li a{
text-decoration:none;
color:#fff;
}
.top-nav ul li a:hover{
background-color: #000;
}
.banner{width:100%;height:600px;
}
.banner img{
width: 100%;height:600px;
}
.banner-top{
width:100%;height:600px;
background: #000;
position: absolute;
top:100px;left:0;
opacity:0.5;
}
.form{
width:400px;height:200px;
position:absolute;
top:50%;left:50%;
margin-left: -200px;margin-top: -200px;
text-align: center;
}
input{
width:400px;height:30px;
margin-top: 20px;
background: none;
border-color: gray;
}
textarea{
width:400px;height:80px;
margin-top:20px;
background: none;
border-color: gray;
}
button{
width:200px;height:50px;
background: none;
margin-top: 20px;
color:#ffffff;
border-color: gray;
}
input:hover{
background:#07cbc9;
}
textarea:hover{
background:#07cbc9;
}
button:hover{
background: blue;
}
.ab-top{
font: "微软雅黑";
}
.ab-top p.p1{
font:60px bold;
text-align: center;
line-height: 200px;
}
.ab-top p span{
padding-bottom:10px;
border-bottom:5px solid #07cbc9;
}
.top-text{
width:600px;
text-align:center;
color:gray;
position: relative;
left:50%;top:0;
margin-left: -300px;
}
.ab-top .top-box{
width:600px;height:500px;
margin:20px auto;
}
.ab-top .pic1 {
width:600px;
float: left;
}
.pic1 img{
width:600px;
}
.top-box1{
width:300px;height:260px;
position: absolute;
left:20%;
}
.top-box1 .p2{
font:30px bold;
}
.boxlayer{
width:300px;height:180px;
position: absolute;
left:0;bottom:0;
background: #fff;
opacity: 0.5;
}
.top-box2{
width:100%;height:200px;
padding:0 25px;
z-index:#999;
}
.top-box1 button{
width:80px;height:40px;
color: #fff;
background: #000;
}
</style>
</head>
<body>
<!-- 顶部 -->
<div class="top">
<img src="images/logo.png">
<div class="top-nav">
<ul>
<li><a href="#">home</a></li>
<li><a href="#">about</a></li>
<li><a href="#">gallery</a></li>
<li><a href="#">faculty</a></li>
<li><a href="#">enents</a></li>
<li><a href="#">contact</a></li>
</ul>
</div>
</div>
<!-- banner -->
<div class="banner">
<img src="images/banner3.jpg">
<div class="banner-top"></div>
<div class="form">
<table>
<form>
<input type="text" name="yourname" placeholder="your name">
<br>
<input type="text" name="yourphone" placeholder="your phone">
<br>
<input type="text" name="yourEmail" placeholder="your Email">
<br>
<textarea name="wirte" placeholder="wirte your comment Here" rows="6" clos="50"></textarea>
<br>
<button>SEND MESSAGE</button>
</form>
</table>
</div>
</div>
<!-- about -->
<div class="ab-top">
<p class="p1">AB<span>O</span>UT</p>
<div class="top-text">
Lorem Ipsum is simple dummy text of the printing and typesetting industry.Lorem Ipsum has been the industry's standard dummy text ever since the 1500s.
</div>
<div class="top-box">
<div class="pic1">
<img src="images/bb3.jpg">
</div>
<div class="top-box1">
<p class="p2">A WORD <br>ABOUT US</p>
<div class="boxlayer"></div>
<div class="top-box2">
<p class="p3">
Praent dignissim viverra est.sed bibendum ligula congue non.sed ad nissuef feils grabvida commodo Suspendisseget ullamcorrper ispsum.Suspendlisse diam ament.
</p>
<button>EXPLORE</button>
</div>
</div>
</div>
</div>
<!-- gallery -->
<!-- 页脚 -->
</body>
</html>1
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