【Bootstrap】img-responsive 有陷阱 要注意 導致 tab 鍵 foucs 失效
(img-responsive) 導致 a:foucs 失效
修正方法
a:focus .img-responsive {
outline-style: dotted;
outline-color: #4169E1;
outline-width: 2px;
}
參考網址：https://stackoverflow.com/questions/24164727/focus-not-working-on-images-during-tab-navigation
