Use Hex Code for Specific Colors...help

Tell us what’s happening:

Your code so far

<style>
  body {
    background-color: #000000;
  }

</style>

Done that but still not working... Need help got stuck there 

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Linux; Android 7.0; TECNO WX3P Build/NRD90M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.84 Mobile Safari/537.36.

Link to the challenge:
https://www.freecodecamp.org/challenges/use-hex-code-for-specific-colors

Thanks…
I just recreate another background color code using black and it works