https://codepen.io/pen/rPrERx?editors=0100

styles.css

body {
  font: 400 1.125rem/1.3 'Titillium Web', Arial, sans-serif;
  background: #888;
  margin: 0;
  padding: 0;
}

p {
  line-height: 1.5;
}

/* Border box on main structural elements */
header,
article,
aside,
footer,
div {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

a {
  text-decoration: none;
}

a,
a:hover,
a:visited {
  color: #1e32c8;
}

a:hover {
  text-decoration: underline;
}

h1 {
  margin: 0;
  padding: .5em 0 .8em;
  font-size: 1.8em;
  line-height: 1.2;
}

h3 {
  margin: 0;
  padding: .4em 0 0;
  font-size: 1.1em;
}

header.main-header {
  display: flex;
  padding: 1em;
  margin: 0 0 .8em;
  background: #eee;
  clear: both;
}

/**
 * Header ------------------
 */
.header-logo {
  display: flex;
  background: white;
  padding: 0;
  border: 1px solid #aaa;
  border-radius: .3em;
  font-size: 1.5em;
}

.header-logo a {
  display: flex;
  align-items: center;
  margin: 0;
  padding: .5em .5em .5em;
  font-size: 1.8em;
  line-height: 1.2;
  font-weight: bold;
  line-height: 1;
  color: #000;
  text-shadow: 1px 1px 0 #fff, 2px 2px 0 #fff, 3px 3px 0 #ccc;
}

.header-logo img {
  display: block;
  width: 70px;
}

.main-header li {
  font-size: 1.2em;
  line-height: 1.8;
  font-weight: 600;
}

.main-header .menu a {
  color: black;
  text-shadow: -2px -2px 0 #fff;
}

[id="primary"] {
  display: flex;
}

[id="primary"] ul {
  display: flex;
  margin: 0;
  padding: 0;
}

[id="primary"] li {
  display: flex;
  align-items: baseline;
  margin: 2em 0 0;
  padding: 0;
  list-style: none;
}

[id="primary"] a {
  padding: 0.5em 0.75em;
}