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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <p>外 box-shadow 前四个参数:x 偏移值、y 偏移值 、模糊半径、扩张半径。</p>
<p>单侧投影的核心是第四个参数:扩张半径。这个参数会根据你指定的值去扩大或缩小投影尺寸,如果我们用一个负的扩张半径,而他的值刚好等于模糊半径,那么投影的尺寸就会与投影所属的元素尺寸完全一致,除非使用偏移量来移动他,否则我们将看不到任何投影。</p>    
    
<div class='left'>左</div>
<div class='right'>右</div>
<div class='top'>上</div>
<div class='bottom'>下</div>
<div class="position">
    <p>box-shadow: -7px 0 5px -5px #333</p>
    <p>box-shadow: 7px 0 5px -5px #333</p>
    <p>box-shadow: 0 -7px 5px -5px #333</p>
    <p>box-shadow: 0 7px 5px -5px #333</p>
</div>
            
          
!
            
              body {
    padding: 20px;
    line-height: 24px;
}
.left,
.right,
.top,
.bottom {
    margin: 30px;
    width: 50px;
    height: 50px;
    line-height: 50px;
    border: 1px solid #000;
    text-align: center;
    
}

//
.left {
    box-shadow: -7px 0 5px -5px #333;
}

.right {
    box-shadow: 7px 0 5px -5px #333;
}

.top {
    box-shadow: 0 -7px 5px -5px #333;
}

.bottom {
    box-shadow: 0 7px 5px -5px #333;
}



/**忽略下面的css代码**/
.position {
    position: absolute;
    top: 100px;
    left: 120px;
    
    p {
        line-height: 83px;
        font-size: 18px;
    }
}
            
          
!
999px
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