HTML+CSS練習---空隙產生記錄
1.第一層和第二層之間的間隙：以為導航欄超過高度朝下擠下來了
2.第2層兩個div中的空隙
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<head><meta charset="UTF-8"><title>Document</title><style>@font-face {font-family: 'iconfont';src: url('./font/iconfont.ttf?t=1722477916565') format('truetype');}.iconfont {font-family: "iconfont" !important;font-size: 16px;font-style: normal;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale;}body{padding: 0;margin: 0;background-color: #F5F5F5;font-size: 16px;font-family: Arial, Helvetica, sans-serif;}.clear::after{content: "";display: block;clear: both;}.clear::before{content: "";display: block;clear: both;}.fl{float: left;}.fr{float: right;}.ml7{margin-left: 7px;}.mr7{margin-right: 7px;}.mtb7{margin: 7px 0px;}ul li{list-style: none;}.layer{margin: 0 auto;}.c5{color: #f50;}a{text-decoration: none;}#header1{background-color: #F5F5F5;height: 36px;width: 1280px;}#header1 .selectcorp{width: 500px;font-size: 16px;background-color: white;}#header1 .corpinfo{height: 30px;line-height: 30px;}#header1 .userinfo{margin-right: 30px;height: 30px;line-height: 30px;}#header1 .userinfo .ritem{margin: 0 15px;}#header1 .userinfo .ritem img{width: 18px;height: 18px;}/* 第2塊 logo部分 */#header2{background-color: #e1e9ff;height: 120px;}#header2 .content1{background-color: #e1e9ff;height: 180px;width: 1280px;background-color: greenyellow;/* overflow: hidden; */}#header2 .content1 .logo{width: 600px;height: 180px;line-height: 180px;background-color: #f50;}#header2 .content1 .logo span{display: inline-block;height: 180px;line-height: 180px;font-size: 50px;font-weight: bold;background-color: #f50;}</style>
</head><body><!-- 第一行登錄信息 --><div id="header1" class="layer clear"><div class="corpinfo mtb7 fl"><span>公司代碼:</span><select class="selectcorp"><option>000XXX--XXXXXXXXX股份有限公司</option></select></div><ul class="userinfo mtb7 fr"><li class="ritem fr"><span class="iconfont"></span><span>安全退出</span></li><li class="ritem fr"><span class="iconfont"></span><span>修改密碼</span></li><li class="ritem fr"><span class="iconfont"></span><span>權限變更</span></li><li class="ritem fr"><span class="iconfont"></span><span>用戶名</span></li> </ul></div><!-- 第2行系統logo --><div id="header2"><div class="content1 layer clear"><div class="logo fl"><img src=""><span>|XXX系統</span></div><div class="logo fr"> <span style="color: #3378cf;">XXX化 XXX化 XXX化</span></div> </div></div><div class="lastone"></div></body>
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