I'm not getting the logo with the icon menu, what can it be?
/*
font-family: 'Oswald', sans-serif;
font-family: 'Open Sans', sans-serif;
*/
/*reset*/
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
/*header*/
.header {
padding: 2px 0;
}
.header .container {
display: flex;
align-items: baseline;
}
.logo {
margin-left: -15px;
}
.icon-menu {
display: block;
width: 40px;
height: 40px;
font-size: 25px;
cursor: pointer;
color: #3f4040;
margin-left: auto;
}
/*menu*/
.nav {
position: absolute;
top: 95px;
left: -100%;
width: 100%;
transition: all 0.4s;
}
.menu {
list-style: none;
padding: 0;
margin: 0;
}
.nav ul li a {
font-family: 'Open Sans', sans-serif;
display: block;
padding: 20px;
text-decoration: none;
color: #777;
border-bottom: 1px solid #ccc;
}
.mostrar {
left: 0;
}
<!DOCTYPE html>
<html lang="pt-br">
<head>
<meta charset="UTF-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Sistemas de Informação - FAPAN</title>
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Open+Sans|Oswald:300,400,700" rel="stylesheet">
<link rel="stylesheet" href="assets/css/normalize.css">
<link rel="stylesheet" href="assets/css/fapan.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script></head><body><headerclass="header">
<class class="container">
<h1 class="logo"><img src="assets/img/logo.png" alt="logo"></h1>
<i class="fa fa-bars icon-menu" id="btn-menu"></i>
<nav class="nav" id="nav">
<ul>
<li><a href="#">Sobre o Curso</a></li>
<li><a href="#">Professores</a></li>
<li><a href="#">Grade</a></li>
<li><a href="#">Galeria</a></li>
<li><a href="#">Alunos</a></li>
</ul>
</nav>
</class>
</header>
<script src="assets/js/index.js"></script>
</body>
</html>