头部

<div class="headBox">
<div class="headReturn" @click="back">返回</div>
<div class="headTitle">通话记录</div>
</div>

.headBox {
height: 45px;
line-height: 45px;
background-color: #3DA3F7;
position: fixed;
top: 0;
left: 0;
width: 100%;
color: #fff;
z-index: 1111;
}

.headReturn {
width: 40px;
text-align: center;
}

.headTitle {
position: absolute;
left: 40%;
top: 0px;
font-size: 18px;
}