How to use rgba in css

<style>
	body {
      background-color:rgba(255,255,255,1)
}
</style>
/*The first number is the red value (from 0 to 255), the second is the green value(from 0 to 255), the
third is the blue value(from 0 to 255), and the last is the opacity (from 0 to 1)

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