How to remove the blue box shadow border in button if clicked

Question

I want to do is remove the button blue box shadow effect in my class btnd if the button is click.

current output:

i tried this but it doesnt w

Answer 1

Blue shadow is browser default :focus state

.btnd:active,
.btnd:focus,
.btnd:focus:active {
  background-image: none;
  outline: 0;
  box-shadow: none;
}