How add CSS

Three ways for styling html elements:

  • link external css file (contains css code) to html document
  • use element <style>
  • use attribute style of html element
    <link rel="stylesheet" href="/css/bootstrap.min.css">
      a mark{
          text-decoration: underline;
          text-decoration-color: #0a5ffe;

    <div style="width: 100%; margin-top: 50px;">

Elements and attributes for styling html document are considered obsolete. For more details see CSS