lbry.tech/app/sass/partials/_modal.scss

.modal {
  @include center;
  top: 0; right: 0;
  bottom: 0; left: 0;

  background-color: rgba($black, 0.5);
  position: fixed;
  z-index: 10;

  h3 {
    @media (min-width: 901px) {
      font-size: 1.5rem;
      margin-bottom: 0.25rem;
    }

    @media (max-width: 900px) {
      font-size: 1.25rem;
    }
  }

  p {
    margin-bottom: 1rem;

    @media (min-width: 901px) {
      font-size: 1.15rem;
      line-height: 1.33;
    }

    @media (max-width: 900px) {
      font-size: 1.05rem;
      line-height: 1.55;
    }

    a {
      color: $teal;
    }
  }
}

.modal-wrap {
  padding: 2rem 1.5rem;
  background-color: $white;

  @media (min-width: 501px) {
    width: 500px;
  }

  @media (max-width: 500px) {
    width: 100%;
  }
}