It seems to be displayed fine on my windows client - at least looks the same as in the browser.
Would be good to:
Upgrade CMS and player to 1.7.9 version
Make sure that IE11 is installed and that those registry entries are correct for your machine - Enabling HTML5 in the Windows .net Player
Since 1.7.8 player should make those changes during installation, but you can double check if everything is fine.
If you’re using Windows 10, make sure that in display settings the Change the size of text, apps and other items is set to 100%.
As for android, R62 and 1.7.9 CMS should suffice
Of course double check that your monitor is set to 1920x1080 resolution as is your layout.
In both cases, you can set the Xibo resolution in display profiles - the default should be full monitor screen though.
You might want to inspect your web page in chrome console and see what it does not like there.
Your background image has transparent part on the right - so that’s why there is ‘black’ (or background) colour when you open it in Xibo.
I’m not sure what’s more Android browser might not like about it though.