css 样式小窍门

css 样式小窍门-LMLPHP
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>页面分布</title>

    <style>

        body {

            margin: ;  /*让整个页面的边距消失*/

        }

        .pg-head {

            height: 40px;

            background-color: dodgerblue;

            line-height: 30px;   /*调整这个标签里面中的文字水平的位置*/

        }

        .w{

            width: 760px;

            margin:   auto; /*居中*/

        }

        ul{

            margin: ;

            list-style-type: none;

        }

        ul li {

            float: left;

            padding: 20px  20px;

            cursor: pointer;

            margin-top: 4px;

            font-size: 5px;

        }

         ul li:hover{    /*伪类,当鼠标移动当该标签上时自动应用此效果*/

             background-color: darkblue;

         }

    </style>

</head>

<body>

    <div class="pg-head">

        <div class="w">

            <ul>

                <li>菜单一</li>

                <li>菜单二</li>

                <li>菜单三</li>

            </ul>

        </div>

    </div>

    <div class="pg-body"></div>

    <div class="pg-footer"></div>

</body>

</html>