<h1 style="background-color:hsla(9, 100%, 64%, 0.6);">tiêu đề 1</h1>
<h1 style="background-color:hsla(9, 100%, 64%, 0.8);">tiêu đề 2</h1>
<h1 style="background-color:hsla(9, 100%, 64%, 1);">tiêu đề 3</h1>
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.