Onclick Button Border Color Change

Should be fairly simple but I'm lost and all searches result in non-specific answers that don't directly relate to my issue. Button, border is black but apparently, the 'depressed'

Solution 1:

The best solution is to use css, try the following code:

.addButton:active, 
 .addButton:focus 
 {
     border:0.5em solid #00c; /* here configure as your needs */color:#00c;
  }

Hope that helps!