JSFiddle - React, Tailwind, and code Playground

HTML

<header id="header" class="row">
      <div class="entete col">
          mineral forge
          <br>
          <br>
          <br>
          <br>(test zoom énorme ou autre)
      </div>
      <nav class="nav col">
          <ul>
              <li><a href="#">Portfolio</a></li>
              <li><a href="#">Personae</a></li>
              <li><a href="#">Services</a></li>
              <li><a href="#">Blog</a></li>
          </ul>
    </nav>
</header>

CSS

/* Nommage à la KNACSS */
.row {
    display: table;
    border-collapse: collapse;
    table-layout: fixed;
    width: 100%;
    vertical-align: top;
}
.col {
    display: table-cell;
}
.entete {
    width: 30%;
    padding: 10px;
    background-color: lightyellow;
}
/* ==navigation */
.nav {
    vertical-align: bottom;
    background-color: lightblue;
}
.nav > ul {
    margin: 0;
    padding: 0;
}
.nav li {
    float: left;
    list-style-type: none;
}
.nav a {
    display: block;
    margin: 0 10px 0 0;
    padding: 4px 6px;
    color: white;
    background-color: maroon;
}