SOURCE

<div class="d1">

</div>
<div class="d2">

</div>
<div class="d3">

</div>

div{
    width: 150px;
    height:150px;

}
.d1{
    border: 2px solid blue;
    display: inline-block;
    background-color: salmon;
}
.d2{
    border: 4px dotted purple;
    outline: 2px solid salmon;
    background-size: cover;
    background-position: center;
    background-image:  url(https://img1.baidu.com/it/u=1224686253,2825596931&fm=253&fmt=auto&app=138&f=JPEG?w=281&h=500);
    box-shadow: 0/*左右*/ 0/*上下*/ 20px/*模糊半径*/ 5px/*扩散半径*/;
    display: inline-block;
    opacity: 50%;
}
.d3{
    border: 3px dashed royalblue;
    display:inline-block;
    background-color: bisque;
}