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如题，父元素一设置背景色就会覆盖了子元素，只有子元素设置z-index时才能显示，我想知道这是什么原因导致的，代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
html,
body {
width: 100%;
height: auto;
font-family: 'Microsoft YaHei',
'微软雅黑',
"Microsoft JhengHei",
'华文细黑',
'STHeiti',
'MingLiu';
color: #2f363b;
box-sizing: border-box;
overflow-y: scroll;
font-size: 100px;
background: #f2f2f2;
}
ul {
list-style: none;
}
a {
text-decoration: none;
}
/* 左浮动 */
.left {
float: left;
}
.right {
float: right;
}
/* 清除浮动 */
.clearfix:before,
.clearfix:after {
content: " ";
display: table;
width: 0;
height: 0;
margin: 0;
padding: 0;
}
.clearfix:after {
clear: both;
}
/* 外框 */
#wrap {
box-sizing: border-box;
overflow: hidden;
}
.content {
padding: 0 0.17rem;
box-sizing: border-box;
}
.imgmd {
height: 100%;
width: 100%;
display: flex;
flex-direction: row;
/* justify-content: center; */
}
#yj {
text-align: center;
/* height: 4.15rem; */
padding-top: 0.75rem;
padding-bottom: 0.885rem;
/* background: #ffffff; */
}
#yj p.color-2f {
margin-bottom: 0.5rem;
font-size: 16px;
}
#yj .yj {
overflow-x: scroll;
overflow-y: hidden;
height: 1.89rem;
display: flex;
flex-direction: row;
justify-content: center;
font-size: 16px;
}
#yj .yj .scro {
width: 4.425rem;
height: 100%;
width: 400%;
display: flex;
flex-direction: row;
justify-content: flex-start;
}
#yj .yj div.left {
position: relative;
width: 1.375rem;
height: 1.825rem;
margin-right: 0.15rem;
/* transition: all 1s ease-in-out; */
z-index: -1;
/* width: 35%; */
flex-shrink: 0;
}
#yj .yj div.left .bgc-img {
position: absolute;
z-index: -1;
width: 100%;
height: 100%;
background: pink;
}
#yj .yj .scro .bgc-img img {
width: 100%;
height: 100%;
}
#yj .yj div.left div.yj-font {
position: absolute;
width: 100%;
color: #58637e;
/* transition: all 1s ease-in-out; */
margin-top: 0.75rem;
padding: 0 0.1rem;
box-sizing: border-box;
}
#yj .yj div.yj_img1 div.yj-font p.f-26,
#yj .yj div.yj_img2 div.yj-font p.f-26 {
margin-bottom: 0.05rem;
line-height: 0.2rem;
}
#yj .yj div.yj_img3 div.yj-font p.f-26 {
/* margin-bottom: 0.3rem; */
margin-bottom: 0.1rem;
}
#yj .yj .scro .img1 {
/* transition: all 1s ease-in-out; */
margin: 0.2rem 0;
height: 0.41rem;
width: 0.41rem;
position: absolute;
left: 50%;
margin-left: -0.2rem;
}
#yj .yj div.yj_img3 {
margin-right: 0;
}
#yj .yj .img2 {
/* width: 24.375rem; */
/* height: 32.0625rem; */
/* transform: translateZ(0); */
transform: scale(1.05);
/* margin-right: 1.75rem; */
}
#yj .yj .scro .yj-font p.f-22,
#yj .yj div.yj_img3 .yj-font p.f-22 {
line-height: 0.2rem;
}
#yj .yj .img2:last-child,
#yj .yj .img1:last-child {
margin-right: 0;
}
</style>
</head>
<body>
<div id="wrap">
<section id="yj" class="content">
<p class="color-2f f-40 ft-weight">XXXXXX</p>
<div class="yj">
<div class="imgmd">
<div class="scro">
<div class="yj_img1 left">
<div class="bgc-img">
<img src="img/index/brokerage_bg1.png" alt="背景图1">
</div>
<img class="img1 " src="img/index/brokerage_icon1.png" alt="XXXX">
<div class="yj-font">
<p class="f-26 color-33">XXX<br>XXXXX</p>
<p class="f-22 color-66 lh-30">XXXXXXXXX<br>XXXXXXXXX</p>
</div>
</div>
<div class="yj_img2 left">
<div class="bgc-img">
<img src="img/index/brokerage_bg2.png" alt="背景图2">
</div>
<img class="img1 " src="img/index/brokerage_icon2.png" alt="XXXXX">
<div class="yj-font">
<p class="f-26 color-33">XXX<br>XXXXX</p>
<p class="f-22 color-66 lh-30">XXXXXXXXXX</p>
</div>
</div>
<div class="yj_img3 left">
<div class="bgc-img">
<img src="img/index/brokerage_bg3.png" alt="背景图3">
</div>
<img class="img1 " src="img/index/brokerage_icon3.png" alt="XXXXX">
<div class="yj-font">
<p class="f-26 color-33">XXXXXXXXXX</p>
<p class="f-22 color-66 lh-30">XXXXXXXXXXXXXXX<br>XXXXXXXXXX</p>
</div>
</div>
</div>
</div>
</div>
</section>
</div>
</body>
</html>
html5
你把子元素的z-index设置为-1了呀