thingtime_review/remix/app/components/Skeleton/RainbowSkeleton.tsx

import React from 'react'
import { Flex } from '@chakra-ui/react'

export const RainbowSkeleton = props => {
  const [rainbowColours] = React.useState([
    '#f34a4a',
    '#ffbc48',
    '#58ca70',
    '#47b5e6',
    '#a555e8'
  ])

  const keyframes = React.useMemo(() => {
    let keyframes = {}
    rainbowColours.forEach((colour, idx) => {
      keyframes[Math.round((idx * 100) / rainbowColours.length) + '%'] = {
        backgroundColor: colour
      }
    })
    keyframes['100%'] = { backgroundColor: rainbowColours[0] }
    return keyframes
  }, [rainbowColours])

  if (props?.loaded) {
    return props?.children
  }

  return (
    <Flex
      cursor='pointer'
      w='10px'
      h='8px'
      borderRadius={'2px'}
      bg={'rgba(0,0,0,0.1)'}
      sx={{
        '@keyframes placeholder-rainbow': keyframes,
        '@keyframes placeholder-opacity': {
          '0%': { opacity: 0.2 },
          '100%': { opacity: 1 }
        },
        // add delay
        animation: `placeholder-rainbow 3s infinite linear, placeholder-opacity 1.3s linear 0s infinite alternate none running}`
      }}
      {...props}
    ></Flex>
  )
}