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<html><head><style>h1.intro { color: blue; text-align: center;}.important { background-color: yellow;}</style></head><body><h1 class="intro important">Header 1</h1><p>A paragraph.</p></body><!-- Mirrored from www.w3schools.com/tags/tryit.asp?filename=tryhtml5_global_class2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 18:05:57 GMT --></html>