css如何实现底部tapbar栏效果

*{
 margin: 0;
 padding: 0;
 text-decoration: none;
 list-style: none;

 }
 .foot {
 width: 100%;
 height: 68px;
 background: #FFFFFF;
 position: fixed;
 bottom: 0;
 display: flex;
 justify-content: space-around;
 z-index: 999;
 /*line-height: 20px;*/
 }

 .foot li {
 height: 100%;
 }

 .foot li a {
 display: block;
 width: 100%;
 height: 100%;
 /* color: #979797;*/
 }

 .foot li a img {
 /*display: block;*/
 width: 26px;
 height: 26px;
 margin-top: 10px;
 }

 .foot li a p {
 font-size: 12px;
 width: 100%;
 text-align: center;
 /* color: #979797;*/
 margin-top: 7px;
 }
 .botm-title{
 color: #979797;
 }

 .actives {
 color: #5C91FA;
 }
 .xz-img{
 text-align: center;
 }

<%--底部tapbar--%>
 <ul class="foot">
 <li class="Imgbox" img="/images/tuiJianCus/index-wxz-icon.png" data-img="/images/tuiJianCus/index-xz-icon.png">
 <a href="/views/tuiJianCus/index.jsp">
 <div class="xz-img">
 <img src="/images/tuiJianCus/index-wxz-icon.png" />
 </div>

 <p class="botm-title">首页推荐</p>
 </a>
 </li>
 <li class="Imgbox" img="/images/tuiJianCus/tuijiang-wxz-icon.png" data-img="/images/tuiJianCus/tuijiang-xz-icon.png">
 <a href="/views/tuiJianCus/tuijian_speed.jsp">
 <div class="xz-img">
 <img src="/images/tuiJianCus/tuijiang-xz-icon.png" />
 </div>

 <p class="botm-title actives ">我的推荐</p>
 </a>
 </li>
 <li class="Imgbox" img="/images/tuiJianCus/my-wxz-icon.png" data-img="/images/tuiJianCus/my-xz-icon.png">
 <a href="/views/tuiJianCus/usercenter.jsp">
 <div class="xz-img">
 <img src="/images/tuiJianCus/my-wxz-icon.png" />
 </div>

 <p class="botm-title ">我的福利</p>
 </a>
 </li>
 </ul>