This is for a standalone HTML element on a page -- therefore I can't modify the actual site code directly. If I remove the @scope it works but other parts of the page are styled that don't need to be. Can anyone offer any help?

@scope {
  div {
    margin-bottom: 0.2em;
  }

  hr {
    border-color: #F8F8F8;
  }

  body {
    font-family: "Open Sans", sans-serif;
  }

  details {
    max-width: 100%;
    overflow: hidden;
    /* Keep this line to prevent an odd blue outline around the element in Safari. */
  }

  summary {
    display: block;
  }

  summary::-webkit-details-marker {
    display: none;
  }

  span {
    position: relative;
    display: flex;
    align-items: center;
    padding-left: 1rem;
    background: #ECECEC;
    color: #000;
    height: 4rem;
  }

  span:hover {
    cursor: pointer;
  }

  span::before {
    content: "+";
    font-size: 1rem;
    display: flex;
    align-items: center;
    margin-right: 0.5rem;
    transition: rotate 200ms 50ms ease-out;
  }

  div.content {
    box-sizing: border-box;
    max-width: 100%;
    max-height: 0;
    overflow: hidden;
    padding: 0 10px;
    border: 2px solid transparent;
    transition: max-height 400ms ease-out, border 0ms 400ms linear;
  }

  details[open]+div.content {
    max-height: 800px;
    /* Set a max-height value enough to show all the content */
    border-color: #ECECEC;
    transition: max-height 400ms ease-out, border 0ms linear;
  }

  details[open] span::before {
    rotate: 90deg;
    transition: rotate 200ms ease-out;
  }
}

<section>
  <details>
    <summary> <span aria-details="pure-css" role="term">Title here</span> </summary>
  </details>

  <div class="content" id="pure-css" role="definition">
    <p>Details here</p>
  </div>
</section>