CSS / JS Preloading with a minor flick

[adtm]

👋 I have a site: https://modest-snyder-8ec1eb.netlify.app/
And during the first render I see a slight flash - when it probably loads up the JS (on a bigger screen, like '15)

Why is there this flash?
The code looks like this:

const Home = () => {
  const { colorMode } = useColorMode();

  const emailButtonColor = useColorModeValue("#FFDB00", "#EB7500");

  return (
    <PageContainer>
      <Box width={["100%", "100%", "80%", 0]}> {"<-- is it because of these?"}
        <Image
          width={500}
          src={colorMode === "light" ? pickingFruitSVG : forestBurningSVG}
          alt="Picking up fruit"
        />
      </Box>
      <HStack>
        <Box p={[0, 0, 0, 10]}>
          <Text
            as="h1"
            fontSize={["2xl", "2xl", "3xl", "4xl"]}  {"<-- or these?"}
            fontWeight="medium"
            maxW={500}
            pb={5}
          >
            ...
          </Text>

          <Text as="h3" lineHeight={1.6}>
            ...
          </Text>
          <Box mt={10}>
            <InputGroup>
              <InputLeftElement children={<EmailIcon color="gray.300" />} />
              <Input
                type="email"
                placeholder="larry@energy.com"
                mb={2}
                maxW={400}
              />
            </InputGroup>
            <Checkbox size="sm" defaultIsChecked>
              ...
            </Checkbox>

            <Box mt={5}>
              <Button
                bg={emailButtonColor}
                style={{ padding: 30 }}
                borderRadius={2}
              >
                Submit
              </Button>
            </Box>
          </Box>
        </Box>
        <Box width={[0, 0, 0, "100%"]}>
          <Image
            width={1400}
            src={colorMode === "dark" ? forestBurningSVG : pickingFruitSVG}
            alt="Picking up fruit"
          />
        </Box>
      </HStack>
    </PageContainer>
  );
};
export default Home;

[adtm]

Removed, but still flicks, have no clue :/

[adtm]

Found the cause because of the second Box in the horizonal container and the width of the image.
Sorry and thank you for being my rubber ducky!

Spend quite some time on this :D