前端 - date属性的input文本框在微信上会出现奇怪的边框？

Question

已经设置了border为none，为什么还会出现这样的情况呢？
uc上没问题，qq和微信是这种情况。
还有为什么qq和微信点击元素周围会有个蓝色的框，放开就没有了

.form-group input[type="date"] {
    border: none;
}

Answer 1

outline: 0;
-webkit-appearance: none;
was removed

Answer 2

Add outline: none;

Answer 3

Try adding outline:0

Answer 4

.form-group input[type="date"] { 
border: 0; 
outline:0;
}

Answer 5

The method is mentioned above, let me explain the reason;
Browsers based on the webkit kernel will add a blue or yellow input to outline by default.