1 Slide with text based background

2 Slide with hex based background

3 Slide with rgb based background

4 Slide with hsl based background

Slide without background

1 Slide with image background

2 Slide with image background #2

3 with opacity

0.5 ≙ 50% opacity

4 More options:

See reveal backgrounds

5 Frontmatter 更改背景

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 bg: red
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 bg: '#ff0000'
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 bg: rgb(70, 70, 255)
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