JSFiddle - React, Tailwind, and code Playground

HTML

<header> This is my header </header>

<iframe src="http://petrucci.mus.auth.gr/imglnks/usimg/e/ec/IMSLP109385-PMLP05770-Sibley.1802.1525.bach.englishsuite.810.pdf",
  id: "pdfRendered" width="800px" height="600px" >

CSS

header {
 background-color: red;
}