CSS: addressed an issue that came up with the SPARC portal.

Thanks a lot @akhuoa for your help on this! Very much appreciated!

Author: agarny

src/renderer/src/assets/app.css

@@ -6,9 +6,21 @@
 @import "primeicons/primeicons.css";
 
 body {
+  *,
+  ::before,
+  ::after {
+    box-sizing: initial;
+  }
+
   .opencor {
     --border-color: var(--p-content-border-color);
 
+    *,
+    ::before,
+    ::after {
+      box-sizing: border-box;
+    }
+
     background-color: var(--p-content-background);
     color: var(--p-content-color);
     margin: 0;