Copy and paste the following code into a new document to see the result
<!doctype html>
<html lang="zxx">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Untitled</title>
<style>
html {
box-sizing: border-box;
}
*,
*::before,
*::after {
box-sizing: inherit;
margin: 0;
padding: 0;
}
body {
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
nav {
width: 100%;
background-color: #101010;
padding: 10px 30px;
display: flex;
justify-content: space-between;
align-items: center;
}
.logo {
display: inline-block;
}
.nav-links {
list-style: none;
display: flex;
}
.nav-item a {
display: inline-block;
padding: 10px 15px;
text-decoration: none;
color: white;
}
.nav-item:hover {
background-color: white;
}
.nav-item:hover a {
color: darkgreen;
}
.logo img {
width: 40px;
vertical-align: middle;
}
</style>
</head>
<body>
<nav class="navbar">
<a href="https://wappler.io" class="logo">
<img src="https://wappler.io/img/logos/wappler-logo.svg" alt="freeCodeCamp logo">
</a>
<ul class="nav-links">
<li class="nav-item"><a href="#">Home</a></li>
<li class="nav-item"><a href="#">Introduction</a></li>
<li class="nav-item"><a href="#">What to do</a></li>
<li class="nav-item"><a href="#">How to do it</a></li>
<li class="nav-item"><a href="#">What to do next</a></li>
</ul>
</nav>
</body>
</html>

As a side note, why not use Bootstrap to save time (and money).