Next up we’ll set up the rules for your header tags. Header tags are important for search engine optimisation so you should try to use them wherever appropriate. A large header for your article title and then smaller headers for sub-sections works best. To define the style of your header tags in your CSS you should add the following lines.
h1 { font-family: Arial; font-size: 36px; color: #000000; }
h2 { font-family: Arial; font-size: 24px; color: #000000; }
h3 { font-family: Arial; font-size: 20px; color: #000000; }
h4 { font-family: Arial; font-size: 18px; color: #000000; }
h5 { font-family: Arial; font-size: 12px; color: #000000; }
h6 { font-family: Arial; font-size: 8px; color: #000000; }
This will give you six header tags which you would use in your HTML like this -
<h1>Main Article Header</h1>
<h2>Sub-Heading</h2>