How to make a "dot" border appear after clicking a button

This time I will show you how to make the button appear with a "dot" border after clicking it, and what are the precautions , the following are Let’s take a look at practical cases.

// A
input  {
　　outline: none;
}
// B
Input::-moz-focus-inner {
　　border:  none;
}
//加了ouline没用，别死磕，重启

I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!

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