<textarea>
  <h1>Neon Rocks!</h1>
</textarea>

body {
  background-color: #2f3742;
  color: #dfe0e4;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

tinymce.init({
  selector: 'textarea',
  skin: 'oxide-dark',
  menubar: false,
  height: 'calc(100vh - 2rem + 12px)',
  plugins: 'image link lists code',
  toolbar: 'undo redo | bold italic | image code',
  content_style: `
@import url('https://fonts.googleapis.com/css?family=Warnes&display=swap');

body {
    background-color: #2f3742;
    color: #dfe0e4;
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

h1 {
    font-size: 80px;
    text-align: center;
    font-family: 'Warnes', cursive;
    color: #fff;
    text-shadow: 0 0 5px #fff, 0 0 10px #fff, 0 0 15px #0073e6, 0 0 20px #0073e6, 0 0 25px #0073e6, 0 0 30px #0073e6, 0 0 35px #0073e6;
}
  `
});