flex height

stackoverflow

HTML

<script src="https://fonts.googleapis.com/icon?family=Material+Icons"></script>
<div app-context>
  <header>
    <h1>Application</h1>
  </header>

  <div class="layout-flex-container row">
    <div class="element">
      <aside>
        <h2>Menu</h2>
        <nav>
          <ul>
            <li>
              <span>
                              <i class="material-icons">person</i>
                              <a href="#">John Doe</a>
                          </span>
            </li>
            <li>
              <span>
                              <i class="material-icons">person</i>
                              <a href="#">Paul Smith</a>
                          </span>
            </li>
            <li>
              <span>
                              <i class="material-icons">person</i>
                              <a href="#">Jean Dupont</a>
                          </span>
            </li>
            <li>
              <span>
                              <i class="material-icons">person</i>
                              <a href="#">Xavier Lin</a>
                          </span>
            </li>
          </ul>
        </nav>
      </aside>
    </div>
  </div>
</div>

CSS

html,
body {
  height: 100%;
}

body {
  margin: 0;
}

div[app-context] {
  height: 100%;
}


/* ************************************************************************** */

.layout-flex-container {
  display: flex;
  align-items: stretch;
  flex-wrap: nowrap;
  /* height: 100%; */
  
  height: calc(100% - 128px);   /* subtract the defined height of the header element */
}

.layout-flex-container.row {
  flex-direction: row;
}

.layout-flex-container.row .element {
  flex: 0 1 auto;
  height: 100%;
}


/* ************************************************************************** */

header {
  display: flex;
  flex-wrap: nowrap;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, .14), 0 3px 1px -2px rgba(0, 0, 0, .2), 0 1px 5px 0 rgba(0, 0, 0, .12);
  box-sizing: border-box;
  border: none;
  width: 100%;
  height: 128px;
  margin: 0;
  padding-bottom: 64px;
  z-index: 3;
  background-color: rgb(63, 81, 181);
  color: rgb(255, 255, 255);
}

header > h1 {
  flex: 1;
  box-sizing: border-box;
  margin: 0;
  padding: 0 40px 0 80px;
  font-family: "Roboto", "Helvetica", "Arial", sans-serif;
  font-size: 20px;
  line-height: 1;
  letter-spacing: .02em;
  font-weight: 400;
}


/* ************************************************************************** */

aside {
  /* height: 100%; */
  width: 340px;
  background: transparent;
  color: #424242;
  z-index: 5;
  
  height: calc(100% - 64px);  /* subtract the defined line-height of the h2 element */
}

aside > h2 {
  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, .14), 0 3px 1px -2px rgba(0, 0, 0, .2), 0 1px 5px 0 rgba(0, 0, 0, .12);
  box-sizing: border-box;
  color: black;
  line-height: 64px;
  padding-left: 40px;
  margin: 0;
  font-family: "Roboto", "Helvetica", "Arial", sans-serif;
  font-size: 20px;
  letter-spacing: .02em;
  font-weight: 400;
}

aside > nav {
  height: 100%;
  background: #fafafa;
  padding-top: 16px;
  box-sizing: border-box;
}

aside >...