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HTML5 & CSS3では、ロゴは左上隅に浮動する必要があります&リスト/メニューのリストは右上隅に浮動する必要があります。ロゴ（浮動小数点：左）＆リスト（浮動小数点：右）は表示されません
ここの出力では、何らかの理由でロゴが見えなくなります。しかし、「alt」は「ロゴの代わりに」と言われました。
ここに私の側からの出力があります。なぜ私は見つけることができません
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" type="text/css" href="Vendors/CSS/normalize.css">
<link rel="stylesheet" type="text/css" href="Vendors/CSS/grid.css">
<link rel="stylesheet" type="text/css" href="Resources/CSS/Style.css">
<link href="https://fonts.googleapis.com/css?family=Lato:100,300,300i,400,400i" type="text/css" rel="stylesheet">
<title>Shyam Restaurant</title>
</head>
<body>
<header>
<nav>
<div class="row">
<img src="Resources/Images/logo-white.png" alt="Shyam Restaurant Logo" class="logo">
<ul class="main-nav">
<li><a href="#">Food Delivery</a></li>
<li><a href="#">How It Works</a></li>
<li><a href="#">Our Cities</a></li>
<li><a href="#">Sign Up</a></li>
</ul>
</div>
</nav>
<div class="hero-text-box">
<h1>Goodbye junk food. <br>Hello super healthy meals</h1>
<a class="btn btn-full" href="#">I'm hungry</a>
<a class="btn btn-ghost" href="#">show me more</a>
</div>
</header>
<section class="section-features">
<div class="row">
<h2>Get food fast — not fast food</h2>
<p class="long-copy">
Hello, we’re Omnifood, your new premium food delivery service. We know you’re always busy. No time for cooking. So let us take care of that, we’re really good at it, we promise!
</p>
</div>
<div class="row">
<div class="col span-1-of-4">
<h3>Up to 365 days/year</h3>
<p>
Never cook again! We really mean that. Our subscription plans include up to 365 days/year coverage. You can also choose to order more flexibly if that's your style.
</p>
</div>
<div class="col span-1-of-4">
<h3>Ready in 20 minutes</h3>
<p>
You're only twenty minutes away from your delicious and super healthy meals delivered right to your home. We work with the best chefs in each town to ensure that you're 100% happy.
</p>
</div>
<div class="col span-1-of-4">
<h3>100% organic</h3>
<p>
All our vegetables are fresh, organic and local. Animals are raised without added hormones or antibiotics. Good for your health, the environment, and it also tastes better!
</p>
</div>
<div class="col span-1-of-4">
<h3>Order anything</h3>
<p>
We don't limit your creativity, which means you can order whatever you feel like. You can also choose from our menu containing over 100 delicious meals. It's up to you!
</p>
</div>
</div>
</section>
</body>
</html>
： 
/*---------------------------------------------------------*/
/*Basic Setup*/
/*---------------------------------------------------------*/
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html {
background-color: #fff;
color: #555555;
font-family: 'Lato', 'Arial', sans-serif;
color: #555555;
font-size: 20px;
font-weight: 300;
text-rendering: optimizeLegibility;
}
/*---------------------------------------------------------*/
/*----------------REUSABLE COMPONENTS----------------------*/
/*---------------------------------------------------------*/
.row {
max-width: 110px;
margin: 0 auto;
}
/*-------------------------HEADINGS------------------------*/
h1 {
margin: 0;
margin-bottom: 20px;
color: #fff;
font-size: 240%;
font-weight: 300;
text-transform: uppercase;
letter-spacing: 1px;
word-spacing: 4px;
}
/*-----------------BUTTONS---------------*/
.btn:link,
.btn:visited {
display: inline-block;
color: #fff;
padding: 10px 30px;
font-weight: 300;
text-decoration: none;
border-radius: 200px;
transition: background-color 0.2s, border 0.2s, color 0.2s;
}
.btn-full:link,
.btn-full:visited {
background-color: #e67e22;
border: 1px solid #e67e22;
color: #fff;
margin-right: 15px;
}
.btn-ghost:link,
.btn-ghost:visited {
color: #e67e22;
border: 1px solid #e67e22;
}
.btn:hover,
.btn:active {
background-color: #cf6d17;
}
.btn-full:hover,
.btn-full:active {
border: 1px solid #cf6d17;
}
.btn-ghost:hover,
.btn-ghost:active {
color: #fff;
border: 1px solid #cf6d17;
}
/*------------------------------------------------------------------------*/
/*----------------------------HEADER--------------------------------------*/
/*------------------------------------------------------------------------*/
header {
background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url(Images/hero.jpg);
background-size: cover;
background-position: center;
height: 100vh;
}
.hero-text-box {
position: absolute;
width: 1140px;
top: 50%;
left: 50%;
transform: translate(-40%,-50%);
}
.logo {
height: 100px;
width: auto;
float: left;
margin-top: 20px;
}
.main-nav {
float: right;
list-style: none;
margin: 55px;
}
.main-nav li {
display: inline-block;
margin-left: 40px;
}
.main-nav li a:link,
.main-nav li a:visited {
padding: 8px 0;
color: #fff;
text-decoration: none;
text-transform: uppercase;
font-size: 90%;
border-bottom: 2px solid transparent;
transition: border-bottom 0.2s;
}
.main-nav li a:hover,
.main-nav li a:active {
border-bottom: 2px solid #e67e22;
}私のHTMLファイルを：私は、Webページの上に白い色でそれをマークしましたロゴが表示されます。
を配置するクラス
rowので、基本的に、彼らは多くの部屋を持っていないことにより、提供さ110pxの最大幅を有する浮遊していますか？ –いいえグリッドは別のベンダーのものです – Shyam