Detailed introduction to the reasons and solutions for CSS borders not displaying

CSS (Cascading Style Sheets) is a language used for style layout and appearance in web design. In actual development, we often encounter situations where CSS borders are not displayed. This is a very common problem and one of the most common mistakes made by Web beginners. This article will introduce in detail the reasons and solutions for CSS borders not showing up.

1. The reason why the border is not displayed

1. The border color is the same as the background color
   If the set border color is the same as the background color, the border will blend with the background color In one piece, the frame is invisible.
2. Border width is 0
   The default width of the CSS border is 0. If the border width is not set, the border will not be displayed.
3. Border style setting error
   There are eight CSS border styles: solid, dashed, dotted, double, groove, ridge, inset, and outset. If the setting is wrong, the border will not be displayed.
4. Overflow attribute setting error
   If the overflow:hidden attribute is set in the box, the box border will be hidden and will not be displayed.
5. Box size setting error
   If the set box size is not large enough, the border will also be squeezed, resulting in no display.

2. Solution

1. Adjust the border color
   Avoid the border color being the same as the background color, which can make the border more distinct and make it appear.
2. Set the border width
   Set the appropriate border width according to your needs. Generally, it is more appropriate to choose 1px or the like.
3. Check the border style
   Make sure the border style is correct. If you need to change it, you can quickly change it through the editor.
4. Modify the overflow attribute
   If you need to display the border of the box, you can try to set the overflow attribute to visible, but doing so may affect the scrolling of some elements inside the box, so be careful when using it.
5. Adjust the box size
   If the box size setting is unreasonable, please adjust the box size appropriately so that it is large enough to accommodate the box border.

In short, in web development, the problem of CSS borders not showing is a common mistake. We need to carefully check the CSS code, find the problem and make timely adjustments to ensure the normal operation and user experience of the web application.

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