The following CSS usually removes the default highlight-border:
input:focus {outline: none; }
It's worth remembering that the outline is a useful visual feedback for the UI focus, for those users not using a mouse (keyboard navigation, for example), and it's worth substituting another visual cue to replace the loss of the outline.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…