修改小程序按钮默认样式

适用于各个平台小程序及uniapp

button {
  position: relative;
  display: block;
  padding: 0;
  margin: 0;
  border:none;
  line-height: auto;
  box-sizing: border-box;
  text-align: center;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
  color: #000000;
  background: none;
}
button::after {
  border: none;
}