Remove root height containment

This breaks the global scope as it affects the main view on PerfLab

Author: WebCloud

front_end/ui/legacy/inspectorCommon.css

@@ -14,10 +14,6 @@
 }
 
 :root {
-  height: 100%;
-  overflow: hidden;
-  /* stylelint-disable-next-line property-no-unknown */
-  interpolate-size: allow-keywords;
   /**
    * NOTE: please don't add to these colours!
    * We are migrating to a new set of theme colors (see below for details) and over time these colors will be deprecated / removed.