Adding style

AMP pages are web pages — any styling to the page and its elements is done using standard CSS properties. However, AMP requires that all CSS is included within a custom style tag in the head of the document, called <style amp-custom>. The <style amp-custom> tag must go inside the<head> of the document. Styles may also be defined inlined if needed. Try adding the following styles to your page:

  <style amp-custom>
    h1 {
      margin: 1rem;
     body {
      background-color: blue;

AMP allows almost all CSS, but there are a few selectors that must be avoided. Learn about those and more about styling in AMP here.