CSS基础学习十六：CSS盒子模型补充之border-radius属性_html/css_WEB-ITnose
CSS盒子模型有很多的内容和属性，CSS也一直在更新和新增属性，今天我们来说说CSS3新增的盒子模型中的
边框中的内容，也就是border-radius属性。
border-radius属性设置元素的边框添加圆角，其实没有边框也可以添加圆角效果。但是要是显示出来，就必须增
加背景色或者边框。
可能的值：xpx；圆角是xpx，半径为xpx的四分之一圆。
语法格式为：
border-radius:apx bpx cpx dpx; 顺时针。当a=b=c=d，写为：border-radius:apx;
这样看起来很抽象，还是拿例子来说明
实例一：没有边框，有背景色的div，给其增加边框圆角属性
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