lbry-desktop/src/ui/scss/component/_header.scss

.header {
  z-index: 2; // Main content uses z-index: 1, this ensures it always scrolls under the header
  position: fixed;
  top: 0;
  width: 100%;
  background-color: $lbry-white;
  border-bottom: 1px solid $lbry-gray-1;
  box-shadow: var(--card-box-shadow) $lbry-gray-1;
  padding-left: var(--spacing-large);
  padding-right: var(--spacing-large);

  [data-mode='dark'] & {
    background-color: var(--dm-color-05);
    color: var(--dm-color-01);
    border-bottom: none;
    box-shadow: var(--card-box-shadow) $lbry-black;
  }

  & > * {
    user-select: none;
  }
}

.header__contents {
  width: 100%;
  height: calc(var(--header-height) - 1px);
  max-width: var(--page-max-width);
  display: flex;
  justify-content: space-between;
  margin: auto;
}

.header__navigation {
  display: flex;
  justify-content: space-between;

  &:last-of-type {
    width: calc(var(--side-nav-width) + var(--spacing-medium));
    @media (max-width: 600px) {
      display: none;
    }
  }
}

.header__navigation-arrows {
  display: flex;
  margin-right: var(--spacing-small);
}

.header__navigation-item {
  height: var(--header-height);
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 0;

  &:hover {
    color: $lbry-teal-5;

    svg {
      stroke: $lbry-teal-5;
    }
  }

  &.header__navigation-item--active {
    &::after {
      height: 0.2em;
      bottom: 0;
      width: 100%;
      background-color: $lbry-teal-5;
      content: '';
      position: absolute;

      [data-mode='dark'] & {
        background-color: $lbry-teal-3;
      }
    }
  }

  // TODO: dark
  [data-mode='dark'] & {
    &:hover {
      color: $lbry-teal-3;

      svg {
        stroke: $lbry-teal-3;
      }
    }

    svg {
      stroke: var(--dm-color-01);
    }
  }
}

.header__navigation-item--back,
.header__navigation-item--forward {
  width: 3rem;
}

.header__navigation-item--lbry {
  flex: 1;
  font-weight: 800;
  font-size: 1.2rem;
  margin-right: var(--spacing-medium);

  .lbry-icon {
    height: 2rem;
    width: 2rem;
  }
}

.header__navigation-item--right-action {
  align-self: flex-end;
  margin-left: auto;
  padding: 0 var(--spacing-small);
}

.header__navigation-item--upgrade {
  color: $lbry-teal-5;
  svg {
    stroke: $lbry-teal-5;
  }
}

@media (max-width: 600px) {
  .header__navigation-item--back,
  .header__navigation-item--forward,
  .header__navigation-item--right-action {
    display: none;
  }
}