导航栏

<div class="daohang">
			<div class="ig" id="qx">
				<img id="" class="app-map-btn app-tap" src="res/im/tq.png"/>
				<span>气象</span>
			</div>
			<div class="ig" id="jt">
				<img id="" class="app-map-btn app-tap" src="res/im/jt.png"/>
				<span>交通</span>
			</div>
			<div class="ig" id="zhuye">
				<img id="" class="app-map-btn app-tap" src="res/im/zhuye.png"/>
				<span>主页</span>
			</div>
			<div class="ig" id="ny">
				<img id="" class="app-map-btn app-tap" src="res/im/ny.png"/>
				<span>农业</span>
			</div>
			<div class="ig" id="ly">
				<img id="" class="app-map-btn app-tap" src="res/im/ly.png"/>
				<span>旅游</span>
			</div>
</div>

div的样式

 .ig {
	    display: table;
	    float: left;
	    width: 20%;    //将5张图片并排 排列
	    text-align: center;
	    line-height: 27px;
	    color: blue;
}

div中图片的样式

.ig img {
    margin: auto;		// 主要靠这个
    width: 53px;
    height: 53px;
}

结果