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Mar 19, 2018 am 10:31 AM

css layout

This time I will bring you the adaptive layout of css. What are the precautions for css adaptive layout? The following is a practical case, let’s take a look.

First of all, I don’t know who came up with this ridiculous and pretentious name. The general idea is that the content in the middle performs width adaptive operations according to the different widths of the browser, while the content on both sides has a fixed width. .

Come on, let’s demonstrate the last code:

 1     <style> 2             *{ 3                 margin: 0; 4                 padding: 0; 5             } 6             .wrap { 7                 background-color: #FBD570; 8                 overflow: hidden; 9             }10             .left {11                 float: left;12                 width: 100px;13                 background: #00f;14                 height: 180px;15             }16             .right {17                 float: right;18                 width: 150px;19                 background: #0f0;20                 height: 200px;21             }22             .center {23                 background: #B373DA;24                 height: 150px;25                 margin-left: 100px;26                 margin-right: 150px;27             }28         </style>29     </head>30     <body>31         <p class="wrap">32             <p class="center">center，可以自适应浏览器宽度，高度可固定也可以由内容撑开。</p>33             <p class="left">left，宽度固定，高度可固定也可以由内容撑开</p>34             <p class="right">right，宽度固定，高度可固定也可以由内容撑开</p>35         </p>36     </body>

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Then the effect will be like this:

The middle part of this big guy is indeed It can change as the width of the browsing window changes:

But, damn, it’s very curious, isn’t it? ! What the hell is the main body in the middle crossing over the content on both sides? What we want is to have them on a horizontal line. Change the code to the following:

 1 <style> 2             *{ 3                 margin: 0; 4                 padding: 0; 5             } 6             .wrap { 7                 background-color: #FBD570; 8                 padding: 0 150px 0 100px; 9                 overflow: hidden;10             }11             .left {12                 float: left;13                 width: 100px;14                 background: #00f;15                 height: 180px;16                   margin-left: -100%;17                   position: relative;18                   left:-100px;19             }20             .right {21                 float: right;22                 width: 150px;23                 background: #0f0;24                 height: 200px;25                 margin-left: -150px;26                 position: relative;27                   right:-150px;28             }29             .center {30                 background: #B373DA;31                 height: 150px;32                 float: left;33                 width: 100%;34             }35         </style>36     </head>37     <body>38         <p class="wrap">39             <p class="center">center，可以自适应浏览器宽度，高度可固定也可以由内容撑开。</p>40             <p class="left">left，宽度固定，高度可固定也可以由内容撑开</p>41             <p class="right">right，宽度固定，高度可固定也可以由内容撑开</p>42         </p>43     </body>

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The idea is as follows: To make the left box go up, you need to set the width of the middle box with a negative left margin, that is,

.left {margin-left:- 100%;}. In this way, the left box can be moved to the far left. To make the box on the right go up

, you need to set its own width with a negative left margin, which is

.right {margin-left: -150px;}. In this way, the right box can display itself on the rightmost side of the row.

　Do you think it’s done? In fact, there is not, because the words "center, yes" in the middle main part are blocked, which means that the two new so-called "flying wings" block the content of the main body. So we still need to move these two small broken wings, but we can't move them outside the screen, because we won't be able to see them.

So, we do the following, use the parent element to set the left and right

padding values, and squeeze the three sub-boxes of the parent toward the middle. That is.wrap{ padding: 0 150px 0 100px;}. This frees up a little space for these two little broken wings.

　Finally, "pull out" the two small broken wings on the left and right respectively, that is

.left{ position: relative; left: -100px;}
.right{position: relative;right: -150px;}

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　In this way, this The layout of the two-way tea cup is completed.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!