chore(*): Apply suggestions from code review

Author: MayaKirova

projects/igniteui-angular/src/lib/grids/grid-base.directive.ts

@@ -7277,8 +7277,8 @@ export abstract class IgxGridBaseDirective implements GridType,
         const pagingHeight = this.getPagingFooterHeight();
         const groupAreaHeight = this.getGroupAreaHeight();
         const scrHeight = this.getComputedHeight(this.scr.nativeElement);
-        const borderTop = parseFloat(styles.getPropertyValue('border-top')) || 0;
-        const borderBottom = parseFloat(styles.getPropertyValue('border-bottom')) || 0;
+        const borderTop = parseFloat(styles.getPropertyValue('border-top-width')) || 0;
+        const borderBottom = parseFloat(styles.getPropertyValue('border-bottom-width')) || 0;
 
         const renderedHeight = toolbarHeight + actualTheadRow +
             footerHeight + pagingHeight + groupAreaHeight +

src/app/grid-auto-size/grid-auto-size.sample.scss

@@ -12,7 +12,6 @@
     max-width: 900px;
 }
 
-
 igx-grid {
     border: 1px solid lightgray;
-  }
+}