所以我想将 .phrase-wrap 居中，这个 div 位于 .carousel 以及主标题图像中。使用 flexbox 将不起作用，因为图像是 .phrase-wrap 的兄弟所以我知道的唯一其他方法是将 .phrase-wrap 设置为绝对位置然后制作上、下、左、右 0；和 margin 自动。除了只是将它移到顶部，如图所示 
有什么想法吗？
p.s 最初创建这个网站的人有多个 css 文件，很抱歉，所有内容都没有样式
#first-block, #second-block, #third-block, #fourth-block {
text-align:center;
padding:3.5rem 0;
}
#carousel {
text-align:center;
background:#e5e5e5;
position: relative;
display: flex;
flex-direction: column;
}
#carousel .header-img {
width: 100%;
}
.phrase-wrap {
position: absolute;
z-index: 1;
top:0;
bottom:0;
left:0;
right:0;
margin: auto;
}
#first-block {
background:#fff;
}
#second-block {
background:#e5e5e5;
}
#third-block {
background:#fff;
}
#fourth-block {
background:#e5e5e5;
}
footer {
background:#fff;
padding:3.5rem 0;
}
@media screen and (max-width: 768px) {
.right {
float:none;
}
}<!DOCTYPE html>
<html lang="en-US">
<head>
<!-- <link rel="stylesheet" type="text/css" href="reset.css"> -->
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>
Gilbert Moving and Storage | Business and Residential Moving Services
</title>
<meta name="description" content="Gilbert Moving & Storage offers Residential and Business moving services. Based out of Gilbert AZ, we can service moves ranging from within the Phoenix valley to nationwide.">
<meta name="keywords" content="Gilbert Moving, Moving Services, AZ Moving Services, Residential Moving, Business Moving">
<link rel="stylesheet" href="css/components.css">
<link rel="stylesheet" href="css/icons.css">
<link rel="stylesheet" href="css/responsee.css">
<link rel="stylesheet" href="owl-carousel/owl.carousel.css">
<link rel="stylesheet" href="owl-carousel/owl.theme.css">
<!-- CUSTOM STYLE -->
<link rel="stylesheet" href="css/template-style.css">
<link href='http://fonts.googleapis.com/css?family=Open+Sans:400,300,600,700,800&subset=latin,latin-ext' rel='stylesheet' type='text/css'>
<script type="text/javascript" src="js/jquery-1.8.3.min.js"></script>
<script type="text/javascript" src="js/jquery-ui.min.js"></script>
<meta name="google-site-verification" content="sIiz7-Oic2Oz1NAPxWDTYSdWosvJHTekqTHo3fOoUmo" />
</head>
<body class="size-1140">
<!-- TOP NAV WITH LOGO -->
<header>
<nav>
<div class="line">
<div class="s-12 l-2">
<a href="index.html">
<img class="s-5 l-12 center" src="img/GilbertMoving_3e.png">
</a>
</div>
<div class="top-nav s-12 l-10 right">
<p class="nav-text">
Menu
</p>
<div class="phone">
<a href="tel:480-825-8648">
(480) 825-8648
</a>
</div>
<ul class="right">
<li>
<a href="/index.html">
Home
</a>
</li>
<li>
<a href="/gallery.html">
Gallery
</a>
</li>
<li>
<a>
Testimonials
</a>
</li>
<li>
<a href="/request-a-quote.html">
Request a Quote
</a>
</li>
</ul>
</div>
</div>
</nav>
</header>
<!-- CAROUSEL -->
<section>
<div id="carousel">
<img src="https://images.pexels.com/photos/2419009/pexels-photo-2419009.jpeg?cs=srgb&dl=beach-clouds-dramatic-2419009.jpg&fm=jpg" alt="header-img" class="header-img">
<div class="phrase-wrap">
<div class="phrase">Here's some catchy phrase for yah.</div>
<div class="quote-btn">Get a quote</div>
</div>
<!-- <div id="owl-demo" class="owl-carousel owl-theme">
<div class="item">
<img src="img/truck4.jpg" alt="Residential and Business Moving Services">
<div class="line">
<h2>
Residential & Business Moving Services
</h2>
</div>
</div>
<div class="item">
<img src="img/packed-truck-slide.jpg" alt="Moving Services in Gilbert AZ">
<div class="line">
<h2>
Expert Packing & Care
</h2>
</div>
</div>
<div class="item">
<img src="img/phone-slide.jpg" alt="Moving Services Free Quote">
<div class="line">
<h2>
Call Today for a Free Quote -
<a href="tel:480-825-8648">
(480) 825-8648
</a>
</h2>
</div>
</div>
</div> -->
</div>
<!-- FIRST BLOCK -->
<div id="first-block">
<div class="line">
<div class="margin">
<div class="s-12 m-6 l-3 margin-bottom">
<i class="icon-message icon3x"></i>
<h2>
About Us
</h2>
<p>
Gilbert Moving & Storage is a family owned and operated business that takes Honesty, Integrity and reliability very seriously. Located in downtown Gilbert, we operate mostly throughout the Phoenix metro area and serve all of Arizona.
</p>
</div>
<div class="s-12 m-6 l-3 margin-bottom">
<i class="icon-star icon3x"></i>
<h2>
Our Promise
</h2>
<p>
Providing our customers with all of their Residential & Commercial moving needs. We will try our best to make your next move as painless and as stress-free as possible. Our Promise to you is that you will always be met with hard working, reliable, and professional movers.
</p>
</div>
<div class="s-12 m-6 l-3 margin-bottom">
<i class="icon-paperplane_ico icon3x"></i>
<h2>
Services
</h2>
<p>
- Local and Long Distance
<br /> - Commercial or Residential
<br /> - Packing/Unpacking Your Items
<br /> - Loading/Unloading PODS
<br /> - Load/Unload Assistance
<br />
</p>
</div>
<div class="s-12 m-6 l-3 margin-bottom">
<i class="icon-mail icon3x"></i>
<h2>
Contact
</h2>
<p>
We will be happy to answer any questions or concerns you may have about our services or the moving process. Call us at
<a href="tel:480-825-8648">
(480) 825-8648
</a>
or
<a href="/request-a-quote.html">
click here
</a>
to request a quote online.
</p>
</div>
</div>
</div>
</div>
<!-- SECOND BLOCK -->
<div id="second-block">
<div class="line">
<div class="margin-bottom">
<div class="margin">
<article class="s-12 m-12 l-8 center">
<h1>
Helping You Move Forward
</h1>
<p>
Gilbert Moving & Storage offers services at an affordable price. Just tell us about your moving needs and we will provide you with quality service that you and your family can count on. You can submit a quote either online by
<a href="/request-a-quote.html">
clicking here
</a>
, or you can contact us by phone at
<a href="tel:480-825-8648">
(480) 825-8648
</a>.
</p>
</article>
</div>
</div>
</div>
</div>
<!-- GALLERY -->
<div id="third-block">
<div class="line">
<h2>
Serving Arizona Residents & Businesses
</h2>
<div class="margin">
<div class="s-12 m-6 l-3">
<img class="margin-bottom" src="img/TruckLoad.JPG">
</div>
<div class="s-12 m-6 l-3">
<img class="margin-bottom" src="img/supplies.jpg">
</div>
<div class="s-12 m-6 l-3">
<img class="margin-bottom" src="img/pad.jpg">
</div>
<div class="s-12 m-6 l-3">
<img class="margin-bottom" src="img/boxes2.jpg">
</div>
</div>
</div>
</div>
<!-- Review Links -->
<div id="fourth-block">
<div class="line">
<h2>
Leave us a Review
</h2>
<div class="margin">
<div class="s-12 m-6 l-4">
<a href="https://www.google.com/search?q=Gilbet+Moving+%26+Storage+Mesa+AZ&oq=Gilbet+Moving+%26+Storage+Mesa+AZ&aqs=chrome..69i57.11701j0j1&sourceid=chrome&ie=UTF-8#q=Gilbert%20Moving%20%26%20Storage%20Mesa%20AZ&tbs=lf_od:-1,lf_oh:-1,lf_pqs:EAE,lf:1,lf_ui:3&rflfq=1&rlha=0&rllag=33380742,-111701127,8192&tbm=lcl&rldimm=2587546689305519927&lrd=0x872bb10b64bd1fa1:0x23e8d00127cb2737,3," target="_blank">
<img class="margin-bottom" src="img/google-logo-3.png">
</a>
</div>
<div class="s-12 m-6 l-4">
<a href="https://www.yelp.com/biz/gilbert-moving-and-storage-mesa-2" target="_blank">
<img class="margin-bottom" src="img/Yelp-Logo-2.png">
</a>
</div>
<div class="s-12 m-6 l-4">
<a href="https://www.facebook.com/gilbertmoving/" target="_blank">
<img class="margin-bottom" src="img/facebook-logo-330-3.png">
</a>
</div>
</div>
</div>
</div>
</section>
<!-- FOOTER -->
<footer>
<div class="line">
<div class="s-12 l-6">
<p>
<span style="font-size: 10px;">
Copyright 2018, Gilbert Moving and Storage
</span>
</p>
</div>
<div class="s-12 l-6">
</div>
</div>
<!-- Google Analytics -->
<script>
(function(i, s, o, g, r, a, m) {
i['GoogleAnalyticsObject'] = r;
i[r] = i[r] || function() {
(i[r].q = i[r].q || []).push(arguments)
}, i[r].l = 1 * new Date();
a = s.createElement(o),
m = s.getElementsByTagName(o)[0];
a.async = 1;
a.src = g;
m.parentNode.insertBefore(a, m)
})(window, document, 'script', 'https://www.google-analytics.com/analytics.js', 'ga');
ga('create', 'UA-90548139-1', 'auto');
ga('send', 'pageview');
</script>
</footer>
<script type="text/javascript" src="js/responsee.js"></script>
<script type="text/javascript" src="owl-carousel/owl.carousel.js"></script>
<script type="text/javascript">
jQuery(document).ready(function($) {
$("#owl-demo").owlCarousel({
navigation: true,
slideSpeed: 300,
paginationSpeed: 400,
autoPlay: true,
singleItem: true
});
$("#owl-demo2").owlCarousel({
slideSpeed: 300,
autoPlay: true,
navigation: true,
pagination: true,
singleItem: true
});
});
</script>
</body>
</html>最佳答案
以下是我用来寻找答案的引用资料的一些链接:
- > https://css-tricks.com/centering-css-complete-guide/
- > https://www.w3.org/Style/Examples/007/center.en.html#hv3
看起来你们真的很亲密!您将不使用水平居中的 margin auto，而是 margin right 50% 和 transform 属性。尽管对于转换属性 https://caniuse.com/#feat=transforms2d 检查浏览器兼容性很重要.这是您将用于居中的代码:
.phrase-wrap {
position: absolute;
z-index: 1;
top: 50%;
left: 50%;
margin-right: -50%;
transform: translate(-50%, -50%);}
关于css - 为什么我不能将此文本居中？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56624198/