老师帮忙批改下，底部的文字无法居中，图片不能全部显示出来被放大了

<style type="text/css">
* {
	margin: 0px;
	padding: 0px;
   }

.top {
	width: 100%;
	height: 100px;
	background-color: black;
	position:fixed;
	top: 0px;
	margin: 0 auto;
}

im {
	float: left;
	cursor: pointer;
}

ul {
	float: right;
}
.im1{margin-top: 100px;
     margin-bottom: 100px;
     width:100%;
     background-repeat: no-repeat;}
ul li {
	   list-style-type: none;
	   display: inline;
	   color: #fff;
	   text-align: center;
	   line-height: 100px;
	   font-size: 25px;
	   font-family: "微软雅黑";
	   margin: 30px;
}
 .nv2 li {
       
	   list-style-type: none;
	   display: inline-block;
	   color: #fff;
	   font-size: 25px;
	   font-family: "微软雅黑";
	   margin: 30px;
	   
}
.foot{
	width: 100%;
	height: 100px;
	background-color: black;
	position: fixed;
	text-align: center;
    line-height: 100px;
	bottom: 0px;
	left: 0px;
    word-spacing:50px;
}
</style>
</head>
<body>
	<div class="top">
		<img alt=""
			src="http://img1.sycdn.imooc.com/climg//58c0d2d900016ce303000100.png">
        <ul>
            <li>课程</li>
            <li>职业路径</li>
            <li>实践</li>
            <li>猿问</li>
            <li>手记</li>
        </ul>
     </div>
     <div class="img1">
     <img alt="" src="http://img1.sycdn.imooc.com/climg//58c0eda50001e12416000480.jpg">
     <img alt="" src="http://img1.sycdn.imooc.com/climg//58c0edb80001c9f216000480.jpg">
     <img alt="" src="http://img1.sycdn.imooc.com/climg//58c0edc9000100d516000480.jpg">
     </div>
     <div class="foot">
     <ul class="nv2">
            <li>课程</li>
            <li>职业路径</li>
            <li>实践</li>
            <li>猿问</li>
            <li>手记</li>
        </ul></div>
</body>

qq_寄给你一朵玫瑰_0 2018-01-25

源自：CSS网页布局基础 2-7 编程练习