即使设置位置元素和 z-index，Z-index 也无法正常工作？
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【中文标题】即使设置位置元素和 z-index，Z-index 也无法正常工作？【英文标题】：Z-index does not work properly even when setting position elements and z-index? 【发布时间】：2022-01-23 03:07:35 【问题描述】：我在我的 CSS 中为元素添加了相对和绝对位置，但它不能正常工作。
这是我的网站标题和功能部分的 html 代码。我想让狗的图像出现在特征部分的后面。我已将特征部分的 z-index 添加为 1，但它没有出现在图像前面。
<!-- Title -->
<div class="row">
<div class="col-lg-6">
<h1>Meet new and interesting dogs nearby.</h1>
<button type="button" class="btn btn-dark btn-lg download-button">
<i class="fab fa-apple"></i> Download
</button>
<button
type="button"
class="btn btn-outline-light btn-lg download-button"
>
<i class="fab fa-google-play"></i> Download
</button>
</div>
<div class="iphone-container col-lg-6">
<img class="iphone" src="images/iphone6.png" />
</div>
</div>
</div>
</section>
<!-- Features -->
<section id="features">
<div class="container-fluid">
<div class="row">
<div class="col-lg-4">
<i class="far fa-check-circle fa-4x feature-img"></i>
<h3>Easy to use.</h3>
<p class="sub-text">So easy to use, even your dog could do it.</p>
</div>
<div class="col-lg-4">
<i class="fas fa-bullseye fa-4x feature-img"></i>
<h3>Elite Clientele</h3>
<p class="sub-text">We have all the dogs, the greatest dogs.</p>
</div>
<div class="col-lg-4">
<i class="fas fa-heart fa-4x feature-img"></i>
<h3>Guaranteed to work.</h3>
<p class="sub-text">
Find the love of your dog's life or your money back.
</p>
</div>
</div>
</div>
</section>
这是我的 CSS 代码
.iphone
width: 60%;
transform: rotate(25deg);
position: absolute;
right: 30%;
.iphone-container
position: relative;
/* Features */
#features
padding: 10% 15%;
position: relative;
text-align: center;
z-index: 1;
我的网站问题的图片
我想要的结果的图像
【问题讨论】：
欢迎来到 Stack Overflow！没有人会为您的站点下载 zip 文件。请阅读how to create a minimal reproducible example。 @disinfor 感谢您的评论。下次我会小心的。 【参考方案1】：请查看我在底部/* additions */ 下所做的 CSS 更改。对于#features部分，默认情况下它有一个白色背景，你实际上必须声明background-color: white;以便CSS知道将白色背景放在section#title的前面
body
font-family: "Montserrat";
#title
background-color: #000b49;
color: white;
h1
font-family: "Montserrat";
font-size: 3.5rem;
line-height: 1.5;
font-weight: 900;
h2
font-family: "Montserrat";
font-size: 2.5rem;
font-weight: 500;
h3
font-size: 1.5rem;
.container-fluid
padding: 3% 15%;
/* Navigation_bar */
.navbar-brand
font-family: "Ubuntu";
font-size: 2.5rem;
font-weight: bold;
.navbar
padding: 0 0 4.5rem;
.nav-item
padding: 0 18px;
.nav-link
font-family: "Montserrat-Light";
font-size: 1.2rem;
.download-button
margin: 5% 3% 5% 0;
/* Title */
.iphone
width: 60%;
transform: rotate(25deg);
position: absolute;
right: 30%;
.iphone-container
position: relative;
/* Features */
#features
padding: 10% 15%;
position: relative;
text-align: center;
z-index: 1;
.feature-img
color: #35589a;
padding-bottom: 15%;
.feature-img:hover
color: #c84b31;
.sub-text
color: #8f8f8f;
/* Testimonials */
#testimonials
text-align: center;
background-color: #0f4d92;
color: white;
.testimonial-image
width: 10%;
border-radius: 100%;
margin: 20px;
#press
background-color: #0f4d92;
text-align: center;
padding: 3%;
.press-logo
width: 15%;
margin: 20px 20px 15px;
.carousel-item
padding: 7% 15%;
/* Pricing section */
#pricing
padding: 100px;
.pricing-col
padding: 3% 2%;
text-align: center;
/* additions */
section#features
position: relative;
background-color: white;
z-index: 1;
section#title
position: relative;
z-index: 0;
img.iphone
height: 400px;
width: 200px;
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Vietalk</title>
<!-- Bootstrap -->
<link
rel="stylesheet"
href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css"
integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2"
crossorigin="anonymous"
/>
<script
src="https://code.jquery.com/jquery-3.5.1.slim.min.js"
integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"
crossorigin="anonymous"
></script>
<script
src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"
integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN"
crossorigin="anonymous"
></script>
<script
src="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.min.js"
integrity="sha384-w1Q4orYjBQndcko6MimVbzY0tgp4pWB4lZ7lr30WKz0vr/aWKhXdBNmNb5D92v7s"
crossorigin="anonymous"
></script>
<!-- CSS Style Sheets -->
<link rel="stylesheet" href="css/styles.css" />
<!-- Google fonts -->
<link rel="preconnect" href="https://fonts.googleapis.com" />
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
<link
href="https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,700;0,900;1,400;1,500&family=Ubuntu:ital,wght@0,400;0,700;1,300&display=swap"
rel="stylesheet"
/>
<!-- Font Awesome -->
<link
rel="stylesheet"
href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css"
integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p"
crossorigin="anonymous"
/>
</head>
<body>
<section id="title">
<div class="container-fluid">
<!-- Nav Bar -->
<nav class="navbar navbar-expand-lg navbar-dark">
<a class="navbar-brand" href="">tindog</a>
<button
class="navbar-toggler"
type="button"
data-toggle="collapse"
data-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent"
aria-expanded="false"
aria-label="Toggle navigation"
>
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="">Contact</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Download</a>
</li>
</ul>
</div>
</nav>
<!-- Title -->
<div class="row">
<div class="col-lg-6">
<h1>Meet new and interesting dogs nearby.</h1>
<button type="button" class="btn btn-dark btn-lg download-button">
<i class="fab fa-apple"></i> Download
</button>
<button
type="button"
class="btn btn-outline-light btn-lg download-button"
>
<i class="fab fa-google-play"></i> Download
</button>
</div>
<div class="iphone-container col-lg-6">
<img class="iphone" src="https://raw.githubusercontent.com/BrianTruong23/tindog/main/TinDog%20Start%20Here/images/iphone6.png" />
</div>
</div>
</div>
</section>
<!-- Features -->
<section id="features">
<div class="container">
<div class="row">
<div class="col-lg-4">
<i class="far fa-check-circle fa-4x feature-img"></i>
<h3>Easy to use.</h3>
<p class="sub-text">So easy to use, even your dog could do it.</p>
</div>
<div class="col-lg-4">
<i class="fas fa-bullseye fa-4x feature-img"></i>
<h3>Elite Clientele</h3>
<p class="sub-text">We have all the dogs, the greatest dogs.</p>
</div>
<div class="col-lg-4">
<i class="fas fa-heart fa-4x feature-img"></i>
<h3>Guaranteed to work.</h3>
<p class="sub-text">
Find the love of your dog's life or your money back.
</p>
</div>
</div>
</div>
</section>
<!-- Testimonials -->
<section id="testimonials">
<div
id="testimonials-carousel"
class="carousel slide"
data-ride="carousel"
>
<ol class="carousel-indicators">
<li
data-target="#carouselExampleIndicators"
data-slide-to="0"
class="active"
></li>
<li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
</ol>
<div class="carousel-inner">
<div class="carousel-item active">
<h2>
I no longer have to sniff other dogs for love. I've found the
hottest Corgi on TinDog. Woof.
</h2>
<img
class="testimonial-image"
src="images/dog-img.jpg"
/>
<em>Pebbles, New York</em>
</div>
<div class="carousel-item">
<h2 class="testimonial-text">
My dog used to be so lonely, but with TinDog's help, they've found
the love of their life. I think.
</h2>
<img
class="testimonial-image"
src="images/lady-img.jpg"
/>
<em>Beverly, Illinois</em>
</div>
</div>
<a
class="carousel-control-prev"
href="#testimonials-carousel"
role="button"
data-slide="prev"
>
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a
class="carousel-control-next"
href="#testimonials-carousel"
role="button"
data-slide="next"
>
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>
</section>
<!-- Press -->
<section id="press">
<img class="press-logo" src="images/techcrunch.png" />
<img class="press-logo" src="images/tnw.png" />
<img class="press-logo" src="images/vn-logo.png" />
<img class="press-logo" src="images/mashable.png" />
</section>
<!-- Pricing -->
<section id="pricing">
<h2>A Plan for Every Dog's Needs</h2>
<p>Simple and affordable price plans for your and your dog.</p>
<div class="row">
<div class="pricing-col col-lg-4 col-md-6">
<div class="card">
<div class="card-header">
<h3>Chihuahua</h3>
</div>
<div class="card-body">
<h2>Free</h2>
<p>5 Matches Per Day</p>
<p>10 Messages Per Day</p>
<p>Unlimited App Usage</p>
<button type="button" class="btn btn-dark btn-lg">Sign Up</button>
</div>
</div>
</div>
<div class="pricing-col col-lg-4 col-md-6">
<div class="card">
<div class="card-header">
<h3>Labrador</h3>
</div>
<div class="card-body">
<h2>$49 / mo</h2>
<p>Unlimited Matches</p>
<p>Unlimited Messages</p>
<p>Unlimited App Usage</p>
<button type="button" class="btn btn-dark btn-lg">Sign Up</button>
</div>
</div>
</div>
<div class="pricing-col col-lg-4 col-md-12">
<div class="card">
<div class="card-header">
<h3>Mastiff</h3>
</div>
<div class="card-body">
<h2>$99 / mo</h2>
<p>Pirority Listing</p>
<p>Unlimited Matches</p>
<p>Unlimited Messages</p>
<p>Unlimited App Usage</p>
<button type="button" class="btn btn-outline-dark btn-lg">
Sign Up
</button>
</div>
</div>
</div>
</div>
</section>
<!-- Call to Action -->
<section id="cta">
<h3>Find the True Love of Your Dog's Life Today.</h3>
<button type="button">Download</button>
<button type="button">Download</button>
</section>
<!-- Footer -->
<footer id="footer">
<p>© Copyright 2021 TinDog</p>
</footer>
</body>
</html>【讨论】：
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