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HomeWeb Front-endCSS TutorialInteresting borders in css
Interesting borders in cssNov 22, 2016 am 10:54 AM
css

border

Simply put, it is our commonly used border. A very basic usage is

border: 1px solid black;
// 等价于
border-width: 1px;
border-style: solid;
border-color: black;

The following is the effect of the demonstration:

Interesting borders in css

Of course, you can also define many weird border types, such as rounded corners (radius) , maybe the compatibility is not very good), ellipse (in fact, as long as you understand the ellipse, you can draw the border at will).

border 1px solid black;
border-radius: 50%;

Interesting borders in css

border-top,-right,-bottom,-left

After reading so many interesting DEMOs, do you really understand borders?

I recently came across an interesting CSS style, which gave me a deep understanding of borders. Usually when we use borders, we basically give the border a width of 1px, and occasionally 2px. We do not find the relationship between the border and the element. When we change the border-width to a larger value, the problem arises.

border: 20px solid gray;

Interesting borders in css

Moreover, the border can be set independently. The values ​​of top, right, bottom, and left are:

border: 20px solid gray;
border-top-width: 40px;
border-left-width: 40px;

Interesting borders in css

How to judge the intersection of border and border?

It is very important to understand this. If you also find this problem, then the following interesting things will come:

border: 20px solid;
border-top-color: black;
border-right-color: red;
border-bottom-color: gray;
border-left-color: blue;

Interesting borders in css

It is actually the line connecting the inner vertex and the outer vertex that separates the border. If you divide the element Both width and height are set to 0, and a radius is added:

width: 0;
height: 0;
border-radius: 50%;

Interesting borders in css

You should also understand the principle of border-radius before!

Use border to implement arrows

Now that we know some basic knowledge of border, we will You can implement arrows commonly seen in dialog boxes, like the following:

Interesting borders in css

This needs to be achieved with the help of transparency in CSS. For example, we need a right arrow, refer to the example above when width and height are 0 , the corresponding border size is 15px, 0px, 15px, 30px, first look at the example below

border-width: 15px 0px 15px 30px;
border-color: black gray;
border-style: solid;

Interesting borders in css

At this time, you need to set the colors of border-top and border-bottom to transparent,

border-color: transparent gray;

Interesting borders in css

Then, for The other three angles of arrows can also be designed in the same way:

Interesting borders in css

Summary

After reading this article, do you think the function of border is very powerful? In fact, some of our common bubbles and shapes can be realized with border. Haha, I really despise those students who use pictures. mutual encouragement.


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