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Help with REALLY SIMPLE script

Hi everybody, my request is really simple :
This page ( ) displays only a live TV player on a white background.
- I would like the TV player to be CENTERED (both horizontally and vertically) on my monitor, which is 2560x1440,
- And I would like to change the background to another color (e.g. #222222)
I know nothing about style development, so...
Thanks in advance !


  • here you are

    @-moz-document url("") {
        body {
            display: flex !important;
            justify-content: center !important;
            align-items: center !important;
            height: 100% !important;
            background-color:#222 !important;
  • Oh wow, it works perfectly !
    @stonecrusher , I can't thank you enough for this. Thank you for helping a newbie. :)
  • No problem, everyone once was a newbie :-)
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