crbtc.org/assets/style/pages/index.css

.index {
  .banner,
  .guides,
  .events,
  .sponsors {

    h4 {
      position: relative;
      width: fit-content;
      color: var(--f-color);
      font-size: 2rem;
      margin: 1.5rem 0;

      &:after {
        content: "";
        position: absolute;
        top: 1.95rem;
        right: -.6rem;
        height: .2rem;
        border: .2rem solid var(--btc);
      }
    }
  }

  .banner h4 {
    margin: 0;
  }

  @media only screen and (max-width: 600px) { 
    .banner,
    .guides,
    .events,
    .sponsors {
      h4 {
        font-size: 1.5rem;
        margin: .5rem auto 0 auto;

        &:after {
          top: 1.5rem;
          right: -.5rem;
          height: .15rem;
          border: .15rem solid var(--btc);
        }
      }
    }
  }
}