css如何实现客服悬浮效果

<div class="sideBar">
 <div>
 <div class="tips">在线客服</div>
 <ul class="list">
 <li>QQ:18492969</li>
 <li>QQ:18492969</li>
 <li>QQ:18492969</li>
 <li>QQ:18492969</li>
 <li>QQ:18492969</li>
 </ul>
 </div>
</div>

.sideBar {
 position:fixed;
 right:-182px;
 top:50px;
 background-color:#ffffff;
 border:#eea236 solid 1px;
 transition:right 0.5s;
 border:solid 1px red;
}
.sideBar:hover {
 right:0;
}
.sideBar>div {
 position:relative;
}
.sideBar .tips {
 position:absolute;
 height:120px;
 line-height:25px;
 background-color:#eea236;
 width:40px;
 left:-40px;
 top:50px;
 text-align:center;
 box-sizing:border-box;
 padding:10px 10px;
 border-top-left-radius:5px;
 border-bottom-left-radius:5px;
 font-weight:bold;
 color:#ffffff;
}
.sideBar .list {
 padding:0;
 list-style:none;
 width:180px;
 margin:0;
}
.sideBar .list>li {
 padding:15px;
 border-top:#eea236 dashed 1px;
}
.sideBar .list>li:hover {
 background-color:#f0ad4e;
 color:#ffffff;
}
.sideBar .list>li:first-child {
 border-top:none;
}