blockscout/apps/explorer_web/assets/css/components/_header.scss

.header {
  @extend %explorer-header-min-height;
  background: explorer-color("gray", "50");
  box-shadow: 0 2px 2px 0 rgba(explorer-color("slate", "900"), 0.16),
              0 0px 2px 0 rgba(explorer-color("slate", "900"), 0.12);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;

  &__container { width: 100%; }
  &__row { vertical-align: middle; }
  &__cell {
    @extend %explorer-header-height;
    &--logo { @extend %explorer-header-square-width; }
    &--links {
      display: flex;
      flex-direction: row-reverse;
      padding-right: explorer-size(0);
    }
    &--search {
      @include explorer-typography("body1");
      padding-left: explorer-size(0);
    }

    &--search-form {
      position: relative;
    }

    &--search-glass {
      height: 16px;
      width: 16px;
      position: absolute;
      top: 14px;
      left: 16px;
      opacity: 0.5;
    }

    &--search-input {
      width: 100%;
      border: none;
      background-color: transparent;
      height: explorer-size(1);
      padding-left: explorer-size(1);
      padding-right: explorer-size(-1);
    }

    &--search-input[placeholder] {
      text-overflow: ellipsis;
    }
  }

  &__logo-link {
    @extend %explorer-header-height;
    @extend %explorer-header-square-width;
    display: flex;
    background: explorer-color("blue", "500");
    align-items: center;
    justify-content: center;
  }

  &__logo {
    width: 32px;
    height: 36px;
    display: block;
  }

  &__link {
    @extend %explorer-header-height;
    display: block;
    text-decoration: none;
    border-top: explorer-size(-4) solid transparent;
    border-left: explorer-size(-4) solid transparent;
    border-right: explorer-size(-4) solid transparent;
    padding: explorer-size(-3);
    color: explorer-color("slate", "900");

    &:hover {
      border-top-color: explorer-color("blue", "500");
      color: explorer-color("blue", "500");
    }

    & + & { margin-right: explorer-size(-2); }
    &--optional { display: none; }
  }

  &__link-name {
    @include explorer-typography("body1");
    margin-left: explorer-size(-3);
  }

  &__link-image, &__link-name {
    display: inline-block;
    vertical-align: middle;
  }
}

@media (min-width: $explorer-breakpoint-sm) {
  .header {
    &__link {
      &--optional { display: block; }
    }
  }
}