div{ outline-color: #2098F5; outline-style: double; outline-width: 1px; outline-offset: 7px; border:1px solid #2098F5; }
效果图:
div{ outline-color: #2098F5; outline-style: double; outline-width: 1px; outline-offset: 7px; border:1px solid #2098F5; }
效果图: