Update top, right, bottom and left properties to inset
This PR updates the css properties from top, right, bottom and left to the --> inset family, supported by all browsers.
I came across this when updating our UI which is using newer dependencies.
The bundling error reported was: Expected shorthand property "inset" left in nav.css
top: 0;
right: 0;
bottom: 0;
left: 0;
-->
inset: 0;
See mozilla - inset and css-tricks
Bundling with gulp bundle runs fine, gulp preview is also without issues.
This PR eases the future upgrade of dependencies as it fixes the shorthand error reported when bundling.