static-cms/src/components/Widgets/MarkdownControlElements/VisualEditor/index.css

.editor {
  position: relative;
  & h1, & h2, & h3 {
    padding: 0;
    color: #7c8382;
    text-decoration: none;
    border-bottom: none;
    margin-bottom: 20px;
    line-height: 1.45;
    &:before {
      content: "# ";
      color: #a5afad;
    }
  }
  & h1 {
    font-size: 2.5rem;
  }
  & h2 {
    font-size: 2rem;
  }
  & h3 {
    font-size: 1.8rem;
  }
  & h2:before {
    content: "## ";
  }
  & h3:before {
    content: "### ";
  }
  & p {
    margin-bottom: 20px;
  }
}

:global {
  & .ProseMirror {
    position: relative;
  }

  & .ProseMirror-content {
    white-space: pre-wrap;
  }

  & .ProseMirror-drop-target {
    position: absolute;
    width: 1px;
    background: #666;
    pointer-events: none;
  }

  & .ProseMirror-content ul, & .ProseMirror-content ol {
    padding-left: 30px;
    cursor: default;
  }

  & .ProseMirror-content blockquote {
    padding-left: 1em;
    border-left: 3px solid #eee;
    margin-left: 0; margin-right: 0;
  }

  & .ProseMirror-content pre {
    white-space: pre-wrap;
  }

  & .ProseMirror-content li {
    position: relative;
    pointer-events: none; /* Don't do weird stuff with marker clicks */
  }
  & .ProseMirror-content li > * {
    pointer-events: auto;
  }

  & .ProseMirror-nodeselection *::selection { background: transparent; }
  & .ProseMirror-nodeselection *::-moz-selection { background: transparent; }

  & .ProseMirror-selectednode {
    outline: 2px solid #8cf;
  }

  /* Make sure li selections wrap around markers */

  & li.ProseMirror-selectednode {
    outline: none;
  }

  & li.ProseMirror-selectednode:after {
    content: "";
    position: absolute;
    left: -32px;
    right: -2px; top: -2px; bottom: -2px;
    border: 2px solid #8cf;
    pointer-events: none;
  }
}