<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title>Tyler</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://fonts.googleapis.com/css?family=Indie+Flower" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Montserrat" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Ubuntu" rel="stylesheet">
<link rel="stylesheet" href="style.css">
</head>
<body>
<header>
<a href="index.html" class="header-brand">bioxm</a>
<nav>
<ul>
<li><a href="portfolio.html">Portfolio</a></li>
<li><a href="about.html">About Me</a></li>
<li><a href="contact.html">Contact</a></li>
</ul>
<a href="cases.html" class="header-cases">Cases</a>
</nav>
</header>
<main>
<section class="index-banner">
<div class="vertical-center">
<h2>I AM A FREELANCE WEB DEVELOPER</h2>
<h1>With specialty in back-end development, functionality, UX design, and Search Engine Optimization</h1>
</div>
</section>
<section class="index-links">
<a href="cases.html">
<div class="index-boxlink-square">
<h3>Cases</h3>
</div>
</a>
<a href="#">
<div class="index-boxlink-rectangle">
<h3>Portfolio</h3>
</div>
</a>
<a href="#">
<div class="index-boxlink-square">
<h3>Bioxm</h3>
</div>
</a>
<a href="#">
<div class="index-boxlink-rectangle">
<h3>Youtube</h3>
</div>
</a>
<a href="#">
<div class="index-boxlink-square">
<h3>About</h3>
</div>
</a>
<a href="#">
<div class="index-boxlink-square">
<h3>Contact</h3>
</div>
</a>
</section>
</main>
<footer>
<ul class="footer-links-main">
<li><a href="#">Home</a></li>
<li><a href="#">Cases</a></li>
<li><a href="#">Portfolio</a></li>
<li><a href="#">About me</a></li>
<li><a href="#">Contact</a></li>
</ul>
<div class="footer-sm">
<a href="https://twitter.com/i/moments?lang=en">
<img src="images/twitter.png" alt="twitter icon">
</a>
</footer>
</section>
</body>
</html>
我试图将img(div类“ footer-sm”)居中放置在列表(footer-links-main)对面的footer标签中,但我可以使图像在底部左右移动不会超过我的列表项。 flex box是实现此目的的最佳方法吗?
这是我的CSS https://pastebin.com/sv3XKhDs