.header__container {
  font-family: $font-asap;
  background: $primary;
  border-bottom: 1px solid $gray;
}

.header {
  display: flex;
  flex-direction: column;
  align-items: center;

  @media (min-width: 768px) {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.header__brand,
.header__nav {
  font-size: 20px;
  line-height: 32px;
  margin: 0;
  padding: 0;
}

.header__nav-list,
.header__nav-item {
  display: inline;
}

.header__nav-item {
  list-style: none;
}

.header__link {
  color: $white;
  text-decoration: none;
  display: inline-block;
  padding: 5px 10px;
  border: 0;
  border-bottom: 5px solid transparent;

  &:active,
  &:focus,
  &:hover {
    border-bottom-color: $accent;
  }

  &--brand {
    font-size: 24px;
    padding: 10px 0 0;

    @media (min-width: 768px) {
      padding: 5px 0;
    }
  }
}

.header__container {
  font-family: $font-asap;
  background: $primary;
  border-bottom: 1px solid $gray;
}

.header {
  display: flex;
  flex-direction: column;
  align-items: center;

  @media (min-width: 768px) {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.header__brand,
.header__nav {
  font-size: 20px;
  line-height: 32px;
  margin: 0;
  padding: 0;
}

.header__nav-list,
.header__nav-item {
  display: inline;
}

.header__nav-item {
  list-style: none;
}

.header__link {
  color: $white;
  text-decoration: none;
  display: inline-block;
  padding: 5px 10px;
  border: 0;
  border-bottom: 5px solid transparent;
  transition: border-color 0.7s ease;

  &:active,
  &:focus,
  &:hover {
    border-bottom-color: $accent;
  }

  &--brand {
    font-size: 24px;
    padding: 10px 0 0;

    @media (min-width: 768px) {
      padding: 5px 0;
    }
  }
}

Add transition to navbar links on hover.
Add transition to navbar links on hover.
