app/common/styles/layout/header.scss

$logoHeight: 40px;
$logoMaxHeight: 100px;
$logoMaxWidth: 125px;

#header__wrapper {
  position: fixed;
  top:0;
  left: 0;
  right:0;
  z-index: 100;
}
.app__version {
  margin-left: 1em;
  display: none;
  @include mediaQuery(x-small) {
    display: inline-block;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
  }
}
header {
  position: relative;
  background: $black;
  color: $white;
  padding: .8em;

  .logo__wrapper {
    display: inline-block;
  }

  #header__logo {
    vertical-align: middle;
    margin-right: 1em;
    float: left;
    height:$logoHeight; //required for <SVG> logos - can remove if using img
    max-height: $logoMaxHeight;
    max-width: $logoMaxWidth;
    width: auto;
  }

}

.header__functions-wrapper {
  color: $white;
  background: green;
  padding: 1em 1.1em;
  box-sizing: border-box;
  display: block;
}