How to deal with CSS web page misalignment-CSS Tutorial-php.cn

How to deal with CSS web page misalignment

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Release： 2017-11-25 11:30:26

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When we make a web page, we must pay attention to several points to make our web page beautiful and smooth. So what should we do if the CSS web page is misaligned? Next, we will bring you how to deal with web page misalignment and how to prevent it.

Why calculate the width

Calculating the pixel width of the web page is for the neat and compatible layout of the CSS web page. It is common for us to calculate the width of the entire page when we lay out the left and right structural web pages or use padding, margin layout. If we do not calculate the width, no matter whether the width is too large or too small, misalignment problems will occur.

How to calculate CSS width

Example 1: We calculate the layout style of a left and right structure.

If the total width is 400px, then the sum of the left and right should be less than 400px, then we may have 300px on the left and 100px on the right

Correct code:

<!DOCTYPE html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>左右结构宽度计算</title> 
<style type="text/css"> 
.yangshi{width:400px;} 
.zuo{ float:left; width:300px; background:#CCC;} 
.you{ float:right; width:100px; background:#999} 
</style> 
</head> 
<body> 
<div class="yangshi"> 
<div class="zuo">左边300px</div> 
<div class="you">右边100px</div> 
</div> 
</body> 
</html>

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Dislocation of the web page CSS width calculation

The above is the correct total width of the left and right structures, which is exactly equal to 400px

Error:

If we keep the total width unchanged, the left side is 300px, and the right side is 300px If it is 120px, then the total width exceeds 20px. Let’s see what problems will occur. The DIV+CSS code is as follows:

 <!DOCTYPE html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>左右结构宽度计算</title> 
<style type="text/css"> 
.yangshi{width:400px;} 
.zuo{ float:left; width:300px; background:#CCC;} 
.you{ float:right; width:120px; background:#999} 
</style> 
</head> 
<body> 
<div class="yangshi"> 
<div class="zuo">左边300px</div> 
<div class="you">右边100px</div> 
</div> 
</body> 
</html>

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DIV CSS layout misalignment diagnosis

Because the total width is about 20px, it causes The left and right structures were not flush, so the right side fell down.

In this way, misalignment compatibility issues arise. Generally, in practice, due to our negligence in calculation, the difference is generally 1px-2px when the difference is small. In this way, we will not discover it, so misalignment compatibility is ruled out. You can start with width calculation.

Example 2: There are 1px border examples in the left and right structures

Generally, there are 1px borders in the left and right structures, and then some borders are added. When we set the left and right structures, we need to match the border width with The left and right structure widths are calculated together.

Correct example:

CSS and html code are as follows:

 <!DOCTYPE html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>左右结构宽度计算</title> 
<style type="text/css"> 
.yangshi{width:400px;} 
.zuo{ float:left; width:298px; border:1px solid #F00; background:#CCC;} 
.you{ float:right; width:98px; background:#999; border:1px solid #F00;} 
</style> 
</head> 
<body> 
<div class="yangshi"> 
<div class="zuo">左边300px</div> 
<div class="you">右边100px</div> 
</div> 
</body> 
</html>

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Since the left and right structures have a width of 1px, each needs to be reduced at this time. Remove the border width of 2 pixels on the left and right, so the left end is 298px and the right side is 98px wide

DIV+CSS set percentage width calculation

Sometimes we also need to use percentages to calculate the width, usually The situation is also the total percentage width, which cannot exceed 100%

Pay attention to the summary when calculating the CSS width:

Whether it is a left-right structure, a multi-column layout, or a single DIV width layout setting, you need to pay attention Grasp and calculate the width, especially when using CSS attributes such as padding, margin, and border. At this time, we need to calculate the occupied width they set, and firmly grasp that the sum of the widths of the same row is less than or It is equal to the total width. If it is larger than the total width, misalignment compatibility will occur. So when there is general misalignment, we can start by calculating the width. Of course, there are many reasons for misalignment. This is also one of the methods to solve the misalignment compatibility problem.

There are so many processing methods. For more exciting information, please pay attention to other related articles on the php Chinese website!