Center modal windows on browser

demo/elements/news-chart/news-chart.css

@@ -165,3 +165,10 @@ button h4 a:focus {
     height: 300px;
   }
 }
+
+div.modal.news-chart.in {
+  display: flex !important;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+}

demo/elements/propaganda-chart/propaganda-chart.css

@@ -165,3 +165,10 @@ a.text.style-scope.propaganda-chart:first-letter {
     padding: 0 !important;
   }
 }
+
+div.modal.propaganda-chart.in {
+  display: flex !important;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+}