mathjs/examples/code_editor/style.css

html,
body {
  margin: 0;
  padding: 0;
  height: 100vh;
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
}

#app {
  display: flex;
  overflow: hidden;
  flex: 1;
  flex-direction: row;
}

#editor {
  flex: 1;
  height: auto;
  display: flex;
  overflow: auto;
}

#editor>.cm-editor {
  flex: 1;
  overflow: scroll;
}

#app>article {
  flex: 1;
  overflow: auto;
  box-sizing: border-box;
}

article.markdown-body .results {
  padding: 0.5em;
  margin: 0.5em;
}

article.markdown-body > .highlighted {
  background-color: rgba(0, 150, 255, 0.2);
}

article.markdown-body {
  box-sizing: border-box;
  min-width: 200px;
  max-width: 980px;
  margin: 0 auto;
  padding: 1em;
}

@media (max-width: 767px) {
  .markdown-body {
    padding: 15px;
  }
}