:root {
    --header-height: 60px;
    --header-height-collapsed: 50px;
}

.js-sticky-navbar {
  position: relative;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: var(--header-height);
  line-height: var(--header-height);
  padding: 0 10vw;
  background: #663399; /* Old browsers */
  background: -moz-linear-gradient(bottom, #663399 0%, #734e99 100%); /* FF3.6-15 */
  background: -webkit-linear-gradient(bottom, #663399 0%,#734e99 100%); /* Chrome10-25,Safari5.1-6 */
  background: linear-gradient(to top, #663399 0%,#734e99 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
  color: white;
  box-shadow: 0 1px 10px rgba(0, 0, 0, 0.3);
}

.js-sticky-navbar li > a {
  display: inline-block;
  height: 100%;
  padding: 0 13px;
  color: white;
}
.js-sticky-navbar li > a:hover {
  background-color: white;
  color: rebeccapurple;
}

.js-sticky-navbar li.active {
  background-color: #422063;
}

.navbar-sticky {
  position: fixed;
  top: 0;
  left: 0;
  height: var(--header-height-collapsed);
  line-height: var(--header-height-collapsed);
  z-index: 100;
  transition: height 0.2s ease, line-height 0.2s ease;
}
.navbar-pushdown {
  display: none;
  height: var(--header-height);
}
.navbar-sticky + .navbar-pushdown {
  display: block;
}