html结构：
<div class="wrapper">
<div class="round">
<span>东邪</span>
<span>西毒</span>
<span>南乞</span>
<span>北丐</span>
</div>
</div>
CSS代码：
.wrapper{
width:100px;
height:100px;
background:lightblue;
border-radius:50%;
border:2px solid lightgreen;
position: absolute;
top:200px;
left:400px;
cursor:pointer;
}
.wrapper:after{
content:‘你猜‘;
display:inline-block;
width:100px;
height:100px;
line-height:100px;
border-radius:50%;
text-align:center;
color:#fff;
font-size:24px;
}
.wrapper:hover .round{
-webkit-transform:scale(1);
opacity:1;
-webkit-animation:rotating 6s 1.2s linear infinite alternate;
}
@-webkit-keyframes rotating{
0%{
-webkit-transform:rotate(0deg);
}
100%{
-webkit-transform:rotate(180deg);
}
}
.round{
width:240px;
height:240px;
border:2px solid lightgreen;
border-radius:50%;
position: absolute;
top:-70px;
left:-70px;
-webkit-transition:all 1s;
-webkit-transform:scale(0.35);
opacity:0;
}
.round span{
width:40px;
height:40px;
line-height:40px;
display:inline-block;
border-radius:50%;
background:lightblue;
border:2px solid lightgreen;
color:#fff;
text-align:center;
position:absolute;
}
.round span:nth-child(1){
right:-22px;
top:50%;
margin-top:-22px;
}
.round span:nth-child(2){
left:-22px;
top:50%;
margin-top:-22px;
}
.round span:nth-child(3){
left:50%;
bottom:-22px;
margin-left:-22px;
}
.round span:nth-child(4){
left:50%;
top:-22px;
margin-left:-22px;
}