padding-top 属性设置元素的上内边距（空间）。
说明该属性设置元素上内边距的宽度。行内非替换元素上设置的上内边距不会影响行高计算，因此，如果一个元素既有内边距又有背景，从视觉上看可能延伸到其他行，有可能还会与其他内容重叠。不允许指定负内边距值。
注释：不允许使用负值。
另请参阅：CSS 教程：CSS 内边距
HTML DOM 参考手册：paddingTop 属性
实例设置 p 元素的上内边距：
p { padding-top:2cm; }亲自试一试
（在页面底部可以找到
CSS padding
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