blockscout/assets/css/components/_header.scss

.header {
  @extend %explorer-header-min-height;
  background: explorer-color("gray", "900");
  box-shadow: 0 2px 2px 0 rgba(explorer-color("slate", "100"), 0.16),
              0 0px 2px 0 rgba(explorer-color("slate", "100"), 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; }
  }

  &__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;
  }
}