The top corners are a larger radius than those at the bottom and the border has a transparency that shows the underlying background and fades out towards the middle.
回顾下来看看，顶端的圆角要比下面的大，边线是在中部渐变透明的。
This text has a border around it and you use the new border-radius style to achieve rounded corners.
文本周围有一个边界，您使用新的border - radius样式来实现4个圆角。
Use generous radius at all corners. The inside corner radius should be a minimum of one material thickness.
在转角处大量采用圆角。圆角内部最小半径为一个壁厚。
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