JSFiddle - React, Tailwind, and code Playground

HTML

<div class="experiment">
  <div class="navigation">
    <div class="navigation__links">
      <div class="navigation__link">
        Name
      </div>
      <div class="navigation__link">
        Sign In
      </div>
      <div class="navigation__link navigation__link_active">
        Sign Up
      </div>
    </div>
  </div>

  <div class="navigation__links">
    <div class="navigation__link">
      Sign Out
    </div>
  </div>
</div>

CSS

body {
  margin: 0;
}

* {
  box-sizing: border-box;
}

.experiment {
  background: #f00;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding-bottom: 16px;
  padding-top: 16px;
  position: fixed;
  width: 320px;
}

.navigation {
  flex: 1 0 0;
  overflow: auto;
}

.navigation__links {
  padding-left: 16px;
  padding-right: 16px;
}

.navigation__link {
  background: #f00;
  color: #fff;
  padding: 16px;
}

.navigation__link_active {
  background: #fff;
  color: #000;
}