UIKIt CSS Hotfix for IE 11

CSS hotfix for IE 11 to address the main PL container height collapsing.

Author: sghoweri

packages/uikit-workshop/src/sass/scss/02-base/_body.scss

@@ -10,6 +10,7 @@
 .pl-c-html {
   min-height: 100%;
   display: flex;
+  height: 100%; // fix for IE 11
 }
 
 .pl-c-body {
@@ -37,4 +38,4 @@
   --theme-text-rgb: 38, 40, 41;
   --theme-primary: white;
   --theme-border: #ddd;
-}
+}