解决方法
你可以这样写：
CSS
span{
background: none repeat scroll 0 0 #F8F8F8;
border: 5px solid #DFDFDF;
color: #717171;
font-size: 13px;
height: 30px;
letter-spacing: 1px;
line-height: 30px;
margin: 0 auto;
position: relative;
text-align: center;
text-transform: uppercase;
top: -80px;
left:-30px;
display:none;
padding:0 20px;
}
span:after{
content:'';
position:absolute;
bottom:-10px;
width:10px;
height:10px;
border-bottom:5px solid #dfdfdf;
border-right:5px solid #dfdfdf;
background:#f8f8f8;
left:50%;
margin-left:-5px;
-moz-transform:rotate(45deg);
-webkit-transform:rotate(45deg);
transform:rotate(45deg);
}
p{
margin:100px;
float:left;
position:relative;
cursor:pointer;
}
p:hover span{
display:block;
}
HTML
<p>Hover here<span>some text here ?</span></p>
