discourse/app/assets/stylesheets/common/components/signup-progress-bar.scss

$progress-bar-line-width: 2px;
$progress-bar-circle-size: 1.2rem;
$progress-bar-icon-size: 0.8rem;

.signup-progress-bar {
  width: 100%;
  display: flex;
  box-sizing: border-box;
  margin-bottom: 1.2em;

  &__segment {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    color: var(--primary-low-mid);

    &:first-child .signup-progress-bar__circle {
      transform: translateX(50%);
      z-index: 1;
    }

    &:last-child {
      width: $progress-bar-circle-size;
      .signup-progress-bar__circle {
        transform: translateX(-50%);
        z-index: 1;
      }
    }
  }

  &__step {
    display: flex;
  }

  &__step-text {
    color: var(--primary-high);
    white-space: nowrap;
    width: fit-content;
    transform: translateX(calc(calc($progress-bar-circle-size / 2) - 50%));

    .signup-progress-bar__segment:first-child & {
      transform: translateX(0%);
    }

    .signup-progress-bar__segment:last-child & {
      transform: translateX(
        calc(calc($progress-bar-circle-size + $progress-bar-line-width) - 100%)
      );
    }

    .--active & {
      font-weight: bold;
      color: var(--primary);
    }
  }

  &__line {
    transform: translateY(
      calc(calc($progress-bar-circle-size + $progress-bar-line-width) / 2)
    );
    height: $progress-bar-line-width;
    width: 100%;
    background-color: var(--primary-low-mid);

    .--completed & {
      background-color: var(--success);
    }
  }

  &__circle {
    flex-shrink: 0;
    font-size: $progress-bar-icon-size;
    color: var(--secondary);
    display: flex;
    justify-content: center;
    align-items: center;
    height: $progress-bar-circle-size;
    width: $progress-bar-circle-size;
    border-radius: 50%;
    border: $progress-bar-line-width solid var(--primary-low-mid);
    background-color: var(--secondary);

    .--active & {
      border-color: var(--success);
      background: var(--success);
      box-shadow: 0 0 1px 5px var(--success-low);
    }
    .--completed & {
      background-color: var(--success);
      border-color: var(--success);
    }
  }

  &__line.--completed {
    background-color: var(--success);
  }
}