discourse-math/assets/stylesheets/common/discourse-math.scss

.math-container {
  &.block-math,
  &.ascii-math {
    display: block;

    // we use tag selectors because MathJax does not provide helpfull classes
    // and the possible combinations a bit absurd. The styles are scoped by the
    // parent selector. So they don't affect any other elements.
    > {
      div,
      span {
        // Mathjax ships with !important inline;
        display: block !important;
        max-width: 100%;
        margin-bottom: 1em;

        // Inner containers for all renderers
        // mathjax generic
        [id*="-Frame"],
        > nobr,
        > span,
        // special handeling for SVG
        &.MathJax_SVG,
        // special handeling for katex
        .katex-html {
          display: block;
          overflow-x: auto;
          max-width: 100%;
          padding: 0.25em 0.5em;
          box-sizing: border-box;
        }
      }
    }

    // On mobile we add a slight fade on either side to indicate that the user can
    // scroll. However, this should not be added to the composer since mathjax does
    // not render in the mobile composer
    .cooked & {
      .mobile-view & {
        position: relative;

        &::before {
          content: "";
          position: absolute;
          z-index: 1;
          left: 0;
          top: 0;
          width: 1em;
          height: 100%;
          background: linear-gradient(
            to right,
            rgb(var(--secondary-rgb), 1) 0%,
            rgb(var(--secondary-rgb), 0) 100%
          );
        }

        &::after {
          content: "";
          position: absolute;
          z-index: 1;
          right: 0;
          top: 0;
          width: 1em;
          height: 100%;
          background: linear-gradient(
            to right,
            rgb(var(--secondary-rgb), 0) 0%,
            rgb(var(--secondary-rgb), 1) 100%
          );
        }

        .MJXp-mtable,
        .MJXp-mstyle {
          padding: 0 0.75em;
        }
      }
    }
  }
}