css3实现好看的边框效果

<div class="box">box</div>
<br>
<div class="border1">border1</div>
<div class="border2">border2</div>
<br>
<div class="border3">border3</div>

<style>
    .box{
        width: 200px;
        height: 100px;
        background: #fff;
         padding: 20px;
        /* 重点样式 */
        border: 20px solid rgba(255,255,255,.5);
        background-clip: padding-box;   
    }
    .border1{
        width: 200px;
        height: 200px;
        margin-left: 100px;
        margin-bottom: 60px;
        background: yellowgreen;
        /* 重点样式 */
        box-shadow: 0 0 0 10px #655,
            0 0 0 15px deeppink,
            0 2px 5px 15px rgba(0,0,0,.6);
    }
    .border2{
        width: 200px;
        height: 200px;
        margin-bottom: 60px;
        /* 重点样式 */
        border: 10px solid #655;
        outline: 5px solid deeppink; 
    }
    .border3{
        width: 200px;
        height:50px;
        background: skyblue;
        border-radius: 10px;
        margin-left: 100px;
        /* 重点样式 */
        box-shadow: 0 0 0 10px blue;
        outline: 20px solid blue
    }
</style>