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<h1 style="background-color:rgb(255, 0, 0);">tiêu đề 1</h1>
<h1 style="background-color:rgb(0, 0, 255);">tiêu đề 2</h1>
<h1 style="background-color:rgb(60, 179, 113);">tiêu đề 3</h1>
<h1 style="background-color:rgb(238, 130, 238);">tiêu đề 4</h1>
<h1 style="background-color:rgb(255, 165, 0);">tiêu đề 5</h1>
<h1 style="background-color:rgb(106, 90, 205);">tiêu đề 6</h1>

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