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掌握css网页布局技术，网页边框效果的定义是基础内容，其中也涉及到css盒模型知识以及css属性简写知识。

相关文章阅读：css设计网页时的一些常用规范

实例一：

css：

p {padding: 15px; border: 1px solid black; }

h5{padding: 0px; border: 1px solid red;}

xhtml：

this is a paragraph that has a padding of 15 pixels on every side: top, right, bottom, and left.

this header has no padding, which places the text right against the border!

效果如图：

实例二：

css：

p {padding: 2%; border: 1px solid black; }

h5{padding: 0px; border: 1px solid red;}

xhtml：

this is a paragraph that has a padding of 5 pixels on every side: left, top, right, and bottom.

this header has no padding. it is only spaced away from the paragraph because the paragraph has a padding of 5 pixels!

效果如图：

实例三：

css：

p { padding-left: 5px; border: 1px solid black; }

h5{

padding-top: 0px;

padding-right: 2px;

padding-bottom: 13px;

padding-left: 21px;

border: 1px solid red;

}

xhtml：

this paragraph had one padding specified(left), using directional declaration.

this header had each padding specified separately, using directional declaration.

效果如图：

实例四：

css：

p {

padding: 5px 15px;

border: 1px solid black;

}

h5{

padding: 0px 5px 10px 3px;

border: 1px solid red;

}

xhtml：

this paragraph has a top and bottom padding of 5 pixels and a right and left padding of 15 pixels.

this header has a top padding of 0 pixels, a right padding of 5 pixels, a bottom padding of 10 pixels, and a left padding of 3 pixels.

效果如图：