下面是我用marign来实现上面那个盒子的效果,完成了练习

#box6{width: 100px;height: 100px;background: #96ff38;border: #fcff00 5px solid; margin: 49px;}
#box5{border: 1px white dashed; background-color: #ffa0df;margin: 3px;}
#box4{border: 1px white dashed; background-color: #ffa0df;}
#box3{background: #ffa0df;padding: 41px; margin: 20px;}
#box2{border: solid 5px #d7effe;margin: 27px;}
#box1{width: 404px; background: white;border: black dashed 1px;}