转自：https://blog.csdn.net/weixin_30394633/article/details/95401902
.btn:focus,.btn:active:focus,
.btn.active:focus,.btn.focus,
.btn:active.focus,.btn.active.focus {
outline: none;
border-color: transparent;
box-shadow:none;
}
bootstrap的button按钮点击后出现蓝色边框的解决 转
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RoyalFlusher说道：
https://t.me/iGaming_live/4869
Google Chrome 
Windows 10