前几天突发奇想，想练一练自己的html布局，就仿照着菜鸟首页写了一个html页，个人感觉还行，下边是效果图跟代码：
菜单栏的小图的实现方法详解:https://blog.csdn.net/qq_39429962/article/details/82795650
源代码：
<!DOCTYPE html>
<html>
<head>
<title>菜鸟教程 - 学的不仅是技术，更是梦想！</title>
<link href="runoob.css" rel="stylesheet" type="text/css"/>
<link href="font.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<!--顶部-->
<div class = "div_top">
<div class = "top_left">
<img class="top_img" src="images/runoob-logo.png"></img>
</div>
<div class = "top_right">
<input class="top_input" type="text" value="" placeholder=" 搜索......"/>
</div>
<div class = "top_menu">
<ul class="top_ul">
<div class="div_li current" name ="li"><li>首页</li></div>
<div class="div_li" name = "li"><li>菜鸟笔记</li></div>
<div class="div_li" name = "li"><li>菜鸟工具</li></div>
<div class="div_li" name = "li"><li>参考手册</li></div>
<div class="div_li" name = "li"><li>用户笔记</li></div>
<div class="div_li" name = "li"><li>测验/考试</li></div>
<div class="div_li" name = "li"><li>本地书签</li></div>
<div class="div_li" name = "li"><li>登录</li></div>
</ul>
</div>
</div>
<!--内容块-->
<div class = "div_bottom">
<div class = "div_menu">
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<h2><i class="fa fa-list"></i> HTML / CSS</h2>
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<div class="up_block">
<a class="item-top item-1"><h4>【学习 HTML】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAJV0lEQVR42oWXCVRU1x3GOW2j4oqi06hEPQLGJZG1ddC4wBgxdUMqEoy1ramtJx4Tj9VojB6NlYi4tFFbMErZBARZXRImiLIzAzMMy8yw7zAg++oGnq//e+fNsJxIOed35vHefff7/su97z0TExOTXxJvTZ078WvLtaKHlutEP1g5i360dhElLpKIpIs3iKRLiGWuIul7H4mk7/+O2CyS2mwRSW23iqR2biKpw3aR1NGd2CGS/tZDJF1BiD1F0pUfD8OL2CVKnG8z+RrpzSKmEKaEya+I8ZPMTA97XZHgcOhuHAnfjaN3PsGxyF04ftcLX8V8jBNxnjiZ4IFT93fg9MPf48yP7vhG6oZ/JG3DueSt8H6yBedTN8MnfRMuZH6Ei1kbcVHmikvyD3E5Zz0u566Hb85aeJ6xfk16S4jpggmTcczJpGmmRw7e8kKU/BbilEGIkF3HPVUwElT/xaPiKPykjUCiNgRxBddxR3UBwYpTuKe5ituqk4jV+CBIdQhB+Z8jqOAAggr3I6hoHwLVexGo+SMCtbsRoPWCn3oLdp1bxAwsF7JgxgyMJyaRgaMHbnrigSoCmeU/ISz7GjSNCsTm3eAGtE05uF90E0W6DCjqpAhVnkZrXwPiNRehaUkl8UMILvgcwYUHEKzej2DNPgRr9yKoeA9uanfAX7sJ19TO2P0tN+BAzCHMmYEJLBVk4MvPvvdAgvI2qlpKoKxJQ0NHFUKyfRGlvIbc2kcIyTmHQl06FPVSPKkMR74uGXFaX24gOP8LhBQeJPHP8H3hblzN34wrqnW4mC/G5cIV+KdajH9pxdjj8y4zsIKYR4hMhEaYOmnahOP7/d0RmxuM1JIHCMzwRVGDHEGZPohUfIecmiQEy8+ioDEVCerrqO4oQlpVhNHAzby/4UqOG7yzP8A5+QqcV4jhq2LiYi7+XbEY10rF+PNFbmAlsYB422BgGjOwz88Nd2Q3kFh0F7fSfCCrfISAjHMIy7mEtPI4BMpOQ1bzEEG5J6kHvkZSeSBu559Adn00EiuuIbb0G5zNWgFvuRg+SjGP/koRiVPk10n8PxVi7L3MDawmLIUymEwUDHz1V++d8Iv1hV+cL24k+MI/4QJu3PMhzhPeuHH/HPzvnyXO4Hr8CZy46YUD/3bBQT9nfOHvjEM3nfH3AAmOBkpwLFiC46ESnAiT4GSEBKciJTh9V4Kdh22YgbWEFTHXYMDMwmLOsbqqUnS0NKG1uYGjq6tGU0MtWprq0dbciI7WJk4bXWuqrxpBc0P1MGo4TxtHU4vQoIBBwYD1KAMWxxpqylFdUYraqnKiDI1koK66HKXFRWSEJtDVo6JEjVZdLVqb6jhtzfVDPG1Au5HGIVqGCA8NGm7AYoSBxtpyGqSjiBtoMnazjv/PaG6sg66+2ihuEB0hSAIdHJ2eVgNNRsJvh4xhgDLQ2daMThrIomUZaGnWm6kq06KZUs2yxEowUnS4YBO/n8PmGkVE2FgGaiv4oPqaSl778mI1laACWrUKJep8qAuUqCQj9dVlI0RHC3a1PUVX+88TER768wbmDTPAolDmZtMNLfy4RJOPylINMtOeQJ6VhrSUR5Bnp0OZk80NZWekooMJk0CptggKOt/d0YIClYIy1ETHrUbuhN9+swFdbaXRQOrjJF7zyjINZJlpUMgzafJCaApViIuJ4sIl9L9KIUdyUiJy5VmorixFeupjPH4kRU9nGz/XTnOx454uPZERYWMYqBsywCaRUWRPkqVISnxAwnncUGNdFR7ej+dNqS9PAY80hQyXlWiQn5dLmUpBb1c7mc6mzDxFb3eHkag74WMYoCYzGEhPSUYdLUXWfOmpychTyNBAGWIGMqgUrDzNujqUUZ+Ul2qRr8yBSplL9zZTeTLQ191JZZSjk8b19XQaiYqMeLOBpuEGSJRFXJCXg6yMFF5vdUEeL8HjJCmKKfIKEk5JTkJRgQqKXBn/ZVHKZVno7+mCksrT1dGG/t5uI3ej7vx/A2zdy7PS+RJjS7BEU0AbVAlvsja6JqNrrK4svRVlxaitruTRMdE+QpWnwLO+bhQV5vPjfJUSGnUhnetBdFTkWAaq9RkQlhfb/eprKqi2akp/Fd8XWIr1DdXOo2Wp5uK9XTxCJvysv4eLPe/vxfNnfZwX7Jf+j46OerMBto93thoMNHFxVnOW7sb6GioJbce0S/a+UbyHi3Ph/iHhF8/68eK5npjou28wMI8ZqNHvZi06YTes42lna5qtYX30BvGOIfG+7qGIhagNoi+fP8PLF0PExkSPYYCeWEy8gjYd1vEFqlxUlZegWFOImsoy/ttAZSgvLRaaayjyIeG+UcLP8eol4wUnNjZmcPTjmL+QkIEvnwoGWBZYzdkqYFuyYWuur6mix3QjX1qs4YbSro/cKG4U1osOvHppJC42dnDYC8kIA0fZ87qVnv2s+VjkTJiVgW06jDbaVkekfnT0xsgFcYPwwCsMcgYQHx8/QHofEAsNb0T8pXT+/HeOsB7Q0kOnslxLKS9FIe1w7P2ALTW24bD3BNaEBgP6jtc33PDoDSln4lx4cACvBwfx+vUgEvQGnIa/E46fOXPmFCurhXwZspcK9jZkWAms8fiTjDUi29M726kR2bbaydc832BYGfoMnc+aT5+Fl7wELAuvKAsD3EhcXNzA7NmzV0+YMGGe8G1gMm7p0qWTLS3nu9jb2nrb2dldcnBwuEr4OTraBzja24fQuXBbG5vI5cuXx9DYuCWLF9+ztrZ+YGlp+YMVsYiOF9M5uhbPxtja2t61t7ePoDnCHB0dg4kAwp/OXacxl5YtW2Zjbm7O6j+DGXiL9YGVldXUVatWzdm8ebO1p6enjYeHh5O7u7vz9u3bN26lv40bN3qsX79+l4uLyx9Wr179Jxr7qVgs/gvDycnpU3bO2dl5j0Qi+cTV1XXnpk2b3GmuLfTrSjjT/U5r1qyxI6OLBHEW/TTjt6GwHKcyV7NmzXqbBi4g1+/STe9v2LDBgSZz2rZt22o3N7d1ZMqFzK2n3w8ZwrEL+XQm1pDgShL8DRmzozneW7hw4SIzM7MFwrpndZ8pfJZNNjF8HQ8zMUW4aC64/LVw0xyBuaampgwLgXcELIRlNRw2frZwv0gQniFEPtnwdfyLUSbYyUmCkWmCmenCjTMEYwZmjsJ8FIZ7pgtzTRWEJwqrb9z/AMygsC9IR1ezAAAAAElFTkSuQmCC">
<strong>HTML，即超文本标记语言（Hyper Text Markup Language）</strong></a>
</div>
<div class="up_block">
<h4>【学习 HTML5】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>HTML5 是下一代 HTML 标准</strong>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 CSS】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>层叠样式表（Cascading StyleSheet）</strong>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 CSS3】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>CSS3是CSS技术的升级版本</strong></a>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 Bootstrap3】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>Bootstrap，来自 Twitter，是目前最受欢迎的前端框架</strong>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 Bootstrap4】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>Bootstrap4 目前是 Bootstrap 的最新版本</strong>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 Font Awesome】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>Font Awesome 是一套绝佳的图标字体库和CSS框架。</strong>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 Foundation】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>Foundation 用于开发响应式的 HTML, CSS and JavaScript 框架</strong>
</div>
</div>
<div class = "block2">
<div class="up_head">
<h2><i class="fa fa-list"></i> JavaScript</h2>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 HTML】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>HTML，即超文本标记语言（Hyper Text Markup Language）</strong></a>
</div>
<div class="up_block">
<h4>【学习 HTML5】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>HTML5 是下一代 HTML 标准</strong>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 CSS】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAAJOgAACToB8GSSSgAAABl0RVh0U29mdHdhcmUAd3d3Lmlua3NjYXBlLm9yZ5vuPBoAAAdlSURBVFiFrZdJjxvHFcd/r6oXsrkOR7NJo0gZy7GhceR4yYKcjFycYy7yLUCOQQ7JR9AHEnI3kACBEcCXnCwkSDS2RtLI9mwas8lhk83urqocujkkldEABlJA8VW/rq73r/9bqijOOQDevnvvt1ZFvwNAANGVFFBSKpWUusVnBFQ1TwQAdKWvxMUYwaUT89Xnn33inIsBPKrmB/Xf3P7wk19tbqwiWuM8DVrhtMJqhVOC8xROKazWF+Pyva6kLOgEpzRWlUCtCLlzjP7x9+Krzz/bBJYBAKz12nz449soTxPWAsZZQe4cytd4vscwzSkEGlHIKDek1mJFMEowM6kEIwqjBDvTVz0pDCOtFk0uAzDWopTi5/d+yMtBgtaas9GEjdUW52nGl8cxH755ncPBmNw5/nUcV25RpVQCSpWu0HLhvhxIrGMkwJUAjOXG5grPvn3Ji5MhVgnX17vUAo/9kwHjrECJIvQ99g6/wwFuFgOqdLUTSIzhvHAkOBILhadA6xKgp18PwFpHnhegFIWxOBTPj2MO44SfvLmF8jR/+ecz1rpNfv3OLf78xVOcgAVy6zicZBxlGbnW4OvSmO+B1shCTF3JwP6Ll/zygzt02hEWOBmOudZtUvc94iTlF3euk1lLPJ5iHaSF4UUy5SjNysD1NTLLiAt3qLL7GtGvYUAJZq0xpqkTHj36AkThRHBAfFzuEoF/Dw6xQGYtw9MzzoYjPE+xrVRpUFd06wqAUuVYl+OXL/YvB3B7+9qzB3/6hLAelQoH1llEFM45lBJwpY+dtRT5FOdm6S0XC8rCuNIsDT9rMP0rTC91QTIek5uyMCmlmE6n1Gs1CmtoNhogYI3B5BmIVLVn0aAsYFk2vDDjcgYAgsBHlEC14zAMKUyBqvxW5BnW2sq4zLZcLSnzgjczcimYKwD4no8f1hDAOodz4LBgIZ1MMKYgCAKSZFytI+RFQS0MK2CQ54ZaGKCUIqzVeLW96iJv+W0pnEA6SbHW4ZxjPE5I0wm9lR4iwsnJKd1eF0FI0xTnHEWe4wdh+WwtohRBGKLUctq9HoCUVWRGaBRFgDBOEpIkARxFYUCEN97YwVhLv98vGUBYX99A6TJg43hAP+5TmILeSg/f9xf2uAxgCZ4IOBw4mE6nHB0f88WjR4hALazxZP8JBwdfk6Ypz549Z5Km9Ho9+v0+j7/cI01TTk5OGQyHbG9vE/gBXz15goggquzlCXoJgFdOTQCOjw7pdjoEQUiz2WRjY4NpNsU6x/n5Ob7vk2c5a2trBEFAURjieEi326Feq7O6usrW5iYOEFFVvyIGhLLwSPVBkRe8/fZb+J5Pnhdsb7cv8v7mzZs8ff6c1V6Ple4Kd+7cQYnC933+s7fH4eExnXaL6zduoBeq3xVpKLhZSjmI4++IBzEvX57hac04TYnqEZN0wtbWFuvr6wRBwMnpKY8f71E7qHH79i2UKK5vXcc5y7PnB3x7dMQH779PEISVmeWgVAv2ESfVCWdptlpsbm2R5zm91VXWrl1Dac1kUkb94709gjBkfW2Nn/38pyil8MOQr7/5hpWVLhsbm7z77j1WVnqMRkkZByKvloHlIHRYxuMxzjpqQcjOzg79eMDBwQtGoxHHR0fcuvUDonqEiOLs7AyAk9NTonrESqfD+vo6By++ZjAYkCRjijyn3W7PAVxVCUUUeV5Qr5WM1IKAe+/sEg+GiAi7u7toXZ52b731I+J+n2mW02o2ubl9ExHhxo0bnI9GJKMRfhCwu7uL5/lzltVVhQhHq9WcB4sI2vO4tro6L78Vh0qE3upqFdWzd+V37XabTrtdzZWlzLqiFAsiClUdwfO6Xo0Xy3sFZNm4VNkjc8PCkix/r7iQALhZHjJf6KJfGJrr5jtnAcgM4Hyd1xAwBzCbOxgMqNdreL6PtQ7f95ikUzzto3V5VfO8Mg609hARjDF4vk+SjGk1m2R5XpVyltiZsfxaBsbjMeejc/IixzlHEJTHcS0MmUzS8pJiLVmR02w0aDabpNMpRV5gjMEBtVrIdDoliqL/ZeQSCuZXMqWkEUU0Go15ulR+zrKcTi0sS+mCXkSo1SNkIQ6KoqDZ9Ofx8UqAiiDvvfde7eHDh3L//n03AyDWub/9/g9/7IgSLaI0oAHtcNpZp61z2hqjjDHaGOMVxqiiMNpaI1pp53me8TzPep5XaK2N1toqrYyIMkopAxgRMdPptPj444+HH330kQfkMvtvCOinT5+GcRxHg8Eg7Pf7QRzH4XA4DAaDQTAcDsM4joPRaOQnSeKPx2MvyzLlnBMRcWEYmnq9bprNZt5ut7N2u521Wq2s0+lk3W532m63s16vN200GqMoiiZ3797NARYBXLTDw0Pv6OjIn0wmQZIk4WAwqKdpGo5GI38ymXhZluk8z1We57N0cL7vO9/3bRAEpl6v51EUpVEUpY1GI+12u1OlVP7pp5/mDx48WDJ4KYCr2sOHD2VnZ0c6nY4MBgMBOD8/d61Wy+3v77v79+9/rwW/N4D/d/svi9M+ICdLgGYAAAAASUVORK5CYII=">
<strong>层叠样式表（Cascading StyleSheet）</strong>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 CSS3】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>CSS3是CSS技术的升级版本</strong></a>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 Bootstrap3】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>Bootstrap，来自 Twitter，是目前最受欢迎的前端框架</strong>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 Bootstrap4】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>Bootstrap4 目前是 Bootstrap 的最新版本</strong>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 Font Awesome】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>Font Awesome 是一套绝佳的图标字体库和CSS框架。</strong>
</div>
<div class="up_block">
<a class="item-top item-1"><h4>【学习 Foundation】</h4>
<img class="codeicon codeicon-36" height="36" width="36" src="data:image/png;base64,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">
<strong>Foundation 用于开发响应式的 HTML, CSS and JavaScript 框架</strong>
</div>
</div>
<script>
function show(){
var li = document.getElementsByName("li");
for(var i=0;i<8;i++){
li[i].onclick = function (){
for(var j=0;j<8;j++){
li[j].className = "div_li";
}
this.className += " current";
}
}
}
show();
</script>
</div>
</body>
</html>runoob.css：
body{
margin:0;
background-color:#f6f6f6;
}
.div_top{
width:100%;
height:124px;
}
.top_left{
width:50%;
height:90px;
/*background:url(./images/runoob-logo.png);*/
float:left;
}
.top_img{
margin-top:28px;
margin-left:19.5%;
}
.top_right{
width:29.8%;
height:41px;
margin-left:11%;
float:left;
margin-top:28px;
background: #eeefed;
border-radius: 3px;
}
.top_input{
margin:2px;
width:445px;
height:31px;
border: 1px solid #c8c8c8;
border-radius: 3px;
font-weight: 400;
font-size:15px;
}
.top_menu{
width:100%;
height:34px;
background-color:#96b97d;
float:left;
white-space: nowrap;
font-weight: 400;
font-size: 13.5px;
font-family: proxima-nova,'Helvetica Neue',Helvetica,Arial,sans-serif;
}
.top_ul{
margin-left:6.5%;
list-style: none;
margin-top:0;
}
.div_li{
float:left;
margin-left:1%;
}
li{
display: inline;
line-height: 34px;
color:#fff;
cursor: pointer;
margin-left:1%;
height:34px;
}
li:hover {
color: #e3efd9;
}
.div_bottom{
width:100%;
height:900px;
margin-top:20px;
}
.div_menu{
font-family: Helvetica Neue,Helvetica,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Noto Sans CJK SC,WenQuanYi Micro Hei,Arial,sans-serif;
width:11.5%;
height:434px;
margin-left:9%;
float:left;
border:0.5px solid rgba(0,0,0,.1);
font-size:14px;
border-radius: 3px;
line-height:35px;
}
.div_menu i{
margin-left: 4%;
}
.menu{
height:28px;
width:99.8%;
color: grey;
background-color: #f2f2f2;
line-height:28px;
}
.menu1{
height:40px;
width:99%;
color: grey;
color: #333;
background:#fff;
border-radius: 3px;
margin-left:1%;
}
.menu2{
height:40px;
width:99%;
color: grey;
color: #333;
border-radius: 3px;
}
.div_block{
width:66.5%;
height:900px;
float:left;
margin-left:1%;
border:1px solid rgba(0,0,0,.1);
border-radius: 3px;;
background-color:#fff;
}
.block1{
width:96%;
height:300px;
margin-left:2%;
margin-top:1.5%;
}
.up_head h2{
font-size: 18px;
border-bottom: 1px solid #eaeaea;
}
.up_block{
width: 28%;
margin: 0 8px 10px 0;
text-align: left;
height: 80px;
background-color: #f6f6f6;
border-radius: 5px;
padding: 6px 16px;
font-size: 12px;
color:#666;
float:left;
}
.up_block h4{
color: #64854c;
font-size: 16px;
margin-top: 10px;
margin-bottom: 10px;
line-height: 1.1;
text-align: left;
}
.up_block img{
margin: 0 5px 8px 5px;
float:left;
}
.block2{
width:96%;
height:300px;
margin-left:2%;
margin-top:5.5%;
}
.current {
background-image: url(http://www.runoob.com/wp-content/themes/runoob/assets/img/navarrow.png);
background-repeat: no-repeat;
background-position: center bottom;
}font.css:
/*!
* Font Awesome 4.7.0 by @davegandy - http://fontawesome.io - @fontawesome
* License - http://fontawesome.io/license (Font: SIL OFL 1.1, CSS: MIT License)
*/@font-face{font-family:'FontAwesome';src:url('../fonts/fontawesome-webfont.eot?v=4.7.0');src:url('../fonts/fontawesome-webfont.eot?#iefix&v=4.7.0') format('embedded-opentype'),url('http://cdn.bootcss.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0') format('woff2'),url('../fonts/fontawesome-webfont.woff?v=4.7.0') format('woff'),url('../fonts/fontawesome-webfont.ttf?v=4.7.0') format('truetype'),url('../fonts/fontawesome-webfont.svg?v=4.7.0#fontawesomeregular') format('svg');font-weight:normal;font-style:normal}.fa{display:inline-block;font:normal normal normal 14px/1 FontAwesome;font-size:inherit;text-rendering:auto;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.fa-lg{font-size:1.33333333em;line-height:.75em;vertical-align:-15%}.fa-2x{font-size:2em}.fa-3x{font-size:3em}.fa-4x{font-size:4em}.fa-5x{font-size:5em}.fa-fw{width:1.28571429em;text-align:center}.fa-ul{padding-left:0;margin-left:2.14285714em;list-style-type:none}.fa-ul>li{position:relative}.fa-li{position:absolute;left:-2.14285714em;width:2.14285714em;top:.14285714em;text-align:center}.fa-li.fa-lg{left:-1.85714286em}.fa-border{padding:.2em .25em .15em;border:solid .08em #eee;border-radius:.1em}.fa-pull-left{float:left}.fa-pull-right{float:right}.fa.fa-pull-left{margin-right:.3em}.fa.fa-pull-right{margin-left:.3em}.pull-right{float:right}.pull-left{float:left}.fa.pull-left{margin-right:.3em}.fa.pull-right{margin-left:.3em}.fa-spin{-webkit-animation:fa-spin 2s infinite linear;animation:fa-spin 2s infinite linear}.fa-pulse{-webkit-animation:fa-spin 1s infinite steps(8);animation:fa-spin 1s infinite steps(8)}@-webkit-keyframes fa-spin{0%{-webkit-transform:rotate(0deg);transform:rotate(0deg)}100%{-webkit-transform:rotate(359deg);transform:rotate(359deg)}}@keyframes fa-spin{0%{-webkit-transform:rotate(0deg);transform:rotate(0deg)}100%{-webkit-transform:rotate(359deg);transform:rotate(359deg)}}.fa-rotate-90{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=1)";-webkit-transform:rotate(90deg);-ms-transform:rotate(90deg);transform:rotate(90deg)}.fa-rotate-180{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=2)";-webkit-transform:rotate(180deg);-ms-transform:rotate(180deg);transform:rotate(180deg)}.fa-rotate-270{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=3)";-webkit-transform:rotate(270deg);-ms-transform:rotate(270deg);transform:rotate(270deg)}.fa-flip-horizontal{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=0, mirror=1)";-webkit-transform:scale(-1, 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0, 0, 0);border:0}.sr-only-focusable:active,.sr-only-focusable:focus{position:static;width:auto;height:auto;margin:0;overflow:visible;clip:auto}runoob-logo.png:
url:http://www.runoob.com/wp-content/themes/runoob//assets/img/runoob-logo.png
另外分享两个能让你更加了解布局的实例:
https://blog.csdn.net/qq_39429962/article/details/82872330
https://blog.csdn.net/qq_39429962/article/details/82763266
下面来说一下说自己的心得：
我们应该将整个页面的布局分配好以后，在逐一往块里边添加元素，这样我们的整体性很好。