Use pure css3 to realize the animation effect code of a circle spreading from the center to the surroundings

Let’s take a simple example first, for example:

@keyframes hovertreemove
{
from {top:30px;}
to {top:130px;}
}

Effect:
http://hovertree.com/texiao/css3/37/1 .htm

You can createanimationsthrough @keyframes rules.

The principle of creating animation is to gradually change one set of CSS styles into another set of styles.
You can change this set of CSS styles multiple times during the animation.
Specify the time when the change occurs as a percentage, or through the keywords "from" and "to", which are equivalent to 0% and 100%.
0% is the start time of the animation, 100% is the end time of the animation.
For best browser support, you should always define 0% and 100% selectors.

The following is the code for up and down movement:

    
说明 

The following is the code for circular diffusion movement:

    
说明 
 
 
 
 

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