bulma/docs/_sass/index/heading.scss

.bd-heading {
  > .icon {
    font-size: $title-size;
    height: 1.125em;
    width: 1.125em;
  }

  .title,
  .subtitle {
    font-weight: $weight-normal;

    strong {
      color: inherit;
      font-weight: $weight-semibold;
    }

    small {
      color: $text-light;
      display: block;
      font-size: 0.75em;
    }
  }

  .subtitle {
    color: $text-light;
  }

  .bd-fat-button {
    font-weight: $weight-normal;

    strong {
      font-weight: $weight-semibold;
    }
  }
}

@include mobile {
  .bd-heading {
    margin-bottom: var(--bd-index-vertical);

    .icon {
      float: left;
      margin-right: $block-spacing / 2;
    }

    .subtitle {
      margin: ($block-spacing / 2) 0 !important;
    }

    form {
      margin-top: $block-spacing;
    }
  }
}

@include tablet {
  .bd-heading {
    align-items: center;
    display: grid;
    grid-gap: 0;
    // prettier-ignore
    grid-template-columns:
      1fr
      4rem
      calc(var(--container-width) / 3)
      calc(var(--container-width) / 3)
      calc(var(--container-width) / 3)
      4rem
      1fr;
    margin-bottom: calc(var(--bd-index-vertical) / 2);

    > .icon {
      grid-column: 2;
    }

    .title {
      grid-column: 3;
      max-width: 9em;
    }

    .subtitle {
      grid-column: 4;
      max-width: 10em;
    }

    .button {
      grid-column: 5 / span 1;
      justify-self: flex-end;
    }
  }
}