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我似乎无法摆脱我整个网站上的轻微边距/填充(目前正在处理 codecademy 作业)。
我查看了整个文档，寻找我不小心添加的任何边距或填充设置，但我似乎无法在任何地方找到它。网站两侧出现空白的原因是什么？
这是我网站的 CSS 和 HTML:
/* Universal Styles */
html {
font-family: "Roboto", sans-serif;
font-size: 16px;
}
body {
border-style: border-box;
}
ul {
list-style-type: none;
}
a {
text-decoration: none;
color: #4A4A4A;
}
.content {
padding: 0;
margin: 0;
}
header .content {
display: flex;
margin: 0 0;
justify-content: space-between;
align-items: center;
height: 85px;
}
.desktop {
}
.desktop ul {
display: flex;
}
.desktop li a {
margin: auto 25px;
display: flex;
align-items: center;
}
.desktop img {
height: 20px;
width: 20px;
}
.mobile {
display: none;
}
#sign-up-section {
background-image: url("banner-landingpage.jpg");
color: white;
}
#sign-up-section .content.center {
background-color: #9DC20A;
margin-top: 170px;
margin-bottom: 170px;
margin-left: 100px;
}
#sign-up-section .cursive {
font-family: Damion, curisve;
font-weight: 50;
font-size: 3em;
}
#sign-up-section .striking {
color: white;
font-size: 50px;
font-family: 'Rubik-Regular', sans-serif;
line-height: 1.4;
}<!DOCTYPE html>
<html>
<head>
<link href="https://fonts.googleapis.com/css?family=Damion" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Rubik" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Roboto:300,400,600,700" rel="stylesheet">
<link rel="stylesheet" href="./resources/css/style.css">
<meta charset="UTF-8">
</head>
<body>
<!-- Header -->
<header>
<div class="content">
<a href="index.html" class="desktop logo">Fotomatic</a>
<nav class="desktop">
<ul>
<li><a href="#">Product detail</a></li>
<li><a href="#">About us</a></li>
<li><a href="https://www.instagram.com/">Follow us <img class="icon" src="./resources/images/instagram.png"></a></li>
</ul>
</nav>
<nav class="mobile">
<ul>
<li><a href="#"><img src="./resources/images/ic-logo.svg"></a></li>
<li><a href="#"><img src="./resources/images/ic-product-detail.svg"></a></li>
<li><a href="#"><img src="./resources/images/ic-about-us.svg"></a></li>
<li><a href="#" class="button">Join us</a></li>
</ul>
</nav>
</div>
</header>
<!-- Main Content -->
<div class="main-content">
<!-- Sign Up Section -->
<div id="sign-up-section" class="banner">
<div id="sign-up-cta">
<div class="content center">
<div class="header">
<h2 class="cursive">Instant</h2>
<h1 class="striking">FORMAT CAMERA</h1>
</div>
<div class="email">
<span>
Email us to request a demo and be in our waiting list for the <strong>Febuary 2017</strong> release!
</span>
<div class="button">Join the waiting list</div>
</div>
</div>
</div>
</div>
<!-- Features Section -->
<div id="features-section">
<div class="feature">
<div class="center">
<div class="image-container">
<img src="./resources/images/feature-1.png" />
</div>
<div class="./resources/content">
<h2>Advanced, automatic, instant</h2>
<h3>Shutter speed, apperture and flash output adjust automatically</h3>
</div>
</div>
</div>
<div class="feature">
<div class="center">
<div class="image-container">
<img src="./resources/images/feature-2.png" />
</div>
<div class="content">
<h2>Beautifully crafted inside-out</h2>
<h3>From the paint outside to the tiny screw inside, Fotomatic is crafted with love and 20-year of expertise</h3>
</div>
</div>
</div>
</div>
<!-- Filters Section -->
<div id="filters-section">
<div class="content center">
<h2>Over 20+ filters to choose from</h2>
<h3>Feed your creativity with 20 different filter designed by our eclectic in-house photographers!</h3>
</div>
<div class="images-container">
<div class="image-container">
<img src="./resources/images/filter-1.png" />
</div>
<div class="image-container">
<img src="./resources/images/filter-2.png" />
</div>
<div class="image-container">
<img src="./resources/images/filter-3.png" />
</div>
<div class="image-container extra">
<img src="./resources/images/filter-4.png" />
</div>
</div>
</div>
<!-- Quotes Section
<div id="quotes-section">
<div class="content center">
<span class="quote">“It’s truly something that could create a brand new photography Renaissance”</span>
<img class="quote-citation" src="./resources/images/photography-logo.png" />
</div>
</div>
<!-- Footer -->
<footer>
<div class="content">
<span class="copyright">© 2016 Fotomatic, All Rights Reserved</span>
<span class="location">Designed in NYC</span>
</div>
</footer>
</div>
</body>
</html>