angular/adev/shared-docs/styles/docs/_steps.scss

// Doc Steps/Ordered Doc section
// Did somebody order a doc?
@use '../media-queries' as mq;

@mixin docs-steps() {
  .docs-steps {
    --gutter: 4rem;
    padding-inline-start: var(--gutter);
    counter-reset: code-steps-list;
    list-style-type: none;

    li {
      position: relative;
    }
  }

  .docs-steps li h3 {
    font-size: 1.75rem;
    margin-block-start: 0;
    margin-block-end: 0.5rem;
    line-height: 2.5rem;
  }

  .docs-step-number {
    counter-increment: code-steps-list;
    display: block;
    pointer-events: none;
    position: absolute;
    left: calc(var(--gutter) * -1);
    top: 1rem;
    bottom: 0;

    &::before {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 2rem;
      content: counter(code-steps-list);
      border-radius: 50%;
      aspect-ratio: 1 / 1;
      border: 1px solid transparent;
      background-image:
        linear-gradient(var(--page-background), var(--page-background)),
        var(--pink-to-purple-horizontal-gradient);
      background-origin: border-box;
      background-clip: content-box, border-box;
      position: sticky;
      top: 2rem;

      // adjust for tablet nav bar height
      @include mq.for-tablet-landscape-down {
        top: calc(1rem + 75px);
      }

      // adjust for mobile nav bar height
      @include mq.for-phone-only {
        top: calc(1rem + 55px);
      }
    }

    .docs-tutorial-content & {
      &::before {
        // calc(1rem + sticky tutorial nav height)
        top: calc(1rem + 120px);

        // adjust for tablet nav bar height
        @include mq.for-tablet-landscape-down {
          top: calc(1rem + 165px);
        }

        // adjust for mobile nav bar height
        @include mq.for-phone-only {
          top: calc(1rem + 140px);
        }
      }
    }

    .docs-tutorial-content:has(.docs-reveal-answer-button) & {
      &::before {
        // calc(1rem + sticky tutorial nav height
        // + reveal answer button height when on smaller screens)
        @container tutorial-content (max-width: 430px) {
          top: calc(1rem + 175px);
        }
      }
    }
  }
}