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

Blue shadow is browser default :focus state

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

I deal with this problem just yesterday. You need:

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

The key is in last selector .btnd:focus:active.