fixed: screenshot of grid has not bottom padding

Fixes #852

Author: starpit

app/plugins/modules/activation-visualizations/web/css/table.css

@@ -389,7 +389,7 @@
 
 /** grid view */
 .activation-viz-plugin .grid-grid:not(.activation-viz-timeline) {
-    padding-top: 1em;
+    padding: 1em 0;
     display: flex;
     flex-wrap: wrap;
     justify-content: center;