4.边框内圆角 - 图1

    1.     .container{
    2.         width: 230px;
    3.         height: 93px;
    4.         background: #655;
    5.         padding: 10px;
    6.     }
    7.     .container div{
    8.         background: tan;
    9.         border-radius: 10px;
    10.         padding: 15px;
    11.         color: #ffffff;
    12.     }

    II

      .container{
        background: tan;
        border-radius: .8em;
        padding: 1em;
        box-shadow: 0 0 0 .6em #655;
        outline: .6em solid #655;
        width: 230px;
        height: 93px;
    }
    注： box-shadow 投影的扩张值不能小于 （根号2-1）*outline值