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我想要做的是将文本（和图像并排或放在文本的顶部）居中，但命令justify-content：center doesn'为我工作。它水平居中但不垂直居中。你能告诉我哪里出了问题吗？我其实是一个初学者，这是我的第一个网站。justify-content：center does not work
下面的代码：
body {
font-family: Gotham A,Gotham B,Helvetica,Arial,sans-serif;
}
h1 {
font-size: 3em;
text-transform:uppercase;
}
h4 {
font-size: 1.5em;
color:#9e9e9e;
}
section {
width: 100%;
display: inline-block;
margin: 0;
max-width: 960;
height:100vh;
vertical-align: middle;
}
#welcome-screen {
width: 100%;
display: table;
margin: 0;
max-width: none;
height:100vh;
background-color:#ebebeb;
padding:0 7%;
}
.heading {
display:table-cell;
vertical-align: middle;
}
.heading-span {
display: block;
color: #8e8e8e;
font-size: 18px;
margin-top: 0px;
text-transform:none;
}
.scrolldown-button {
position: absolute;
display: table;
text-align: center;
bottom: 30px;
left: 0;
right: 0;
margin: 0 auto 0 auto;
width: 48px;
height: 48px;
font-size:20px;
}
a {
color:#000000;
transition: ease-in-out 0.15s
}
a:hover{
color:#fbd505;
}
#content {
width: 100%;
height:100vh;
}
.wrapper {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
}
p {
display:column;
vertical-align: middle;
max-width: 960px;
}
.content-heading-span {
display: block;
font-size: 32px;
margin-top: 0px;
text-transform:uppercase;
margin-left:-20px;
}<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<title>Test</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel='stylesheet prefetch' href='https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css'>
<link rel="stylesheet" href="css/style.css">
<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">
<link rel="stylesheet" href="https://cloud.typography.com/6493094/7214972/css/fonts.css">
</head>
<body>
<section id="welcome-screen">
<div class="heading">
<h1><span class="heading-span">Hi! My name is</span>
<strong>John Doe</strong>
</h1>
</div>
<div class="scrolldown-button">
<a href="#content"><span class="glyphicon glyphicon-chevron-down" aria-hidden="true"></span></a>
</div>
</section>
<section>
<div id="content">
<div class="wrapper">
<p><span class="content-heading-span"><strong>O Mnie</strong></span>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin eget bibendum odio, eget varius tortor. Etiam imperdiet, sem in faucibus convallis, justo purus rutrum magna, ut lacinia ex tellus sit amet lectus. Curabitur tempor imperdiet laoreet. Quisque magna magna, tempus a nibh vitae, maximus malesuada mi. Nulla a justo dolor. Nullam risus nisl, vulputate vel arcu id, viverra finibus mauris. Donec porttitor lectus ut augue vehicula, vitae vehicula turpis eleifend. Proin eu quam at odio consectetur tincidunt. Proin eget elit id purus lacinia tincidunt. Nam at urna est. Quisque viverra nisi eu molestie accumsan. Ut at porttitor sem, quis viverra massa. Nulla odio libero, dictum a diam euismod, rhoncus efficitur lectus. Suspendisse eu mi vel diam euismod fermentum at et.</p>
<p><span class="content-heading-span"><strong>O Mnie</strong></span>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin eget bibendum odio, eget varius tortor. Etiam imperdiet, sem in faucibus convallis, justo purus rutrum magna, ut lacinia ex tellus sit amet lectus. Curabitur tempor imperdiet laoreet. Quisque magna magna, tempus a nibh vitae, maximus malesuada mi. Nulla a justo dolor. Nullam risus nisl, vulputate vel arcu id, viverra finibus mauris. Donec porttitor lectus ut augue vehicula, vitae vehicula turpis eleifend. Proin eu quam at odio consectetur tincidunt. Proin eget elit id purus lacinia tincidunt. Nam at urna est. Quisque viverra nisi eu molestie accumsan. Ut at porttitor sem, quis viverra massa. Nulla odio libero, dictum a diam euismod, rhoncus efficitur lectus. Suspendisse eu mi vel diam euismod fermentum at et.</p>
</div>
</div>
</body>
</html>
简直不敢相信那么简单。谢谢！ –
@TomaszCzechowski没问题！ –