diff --git a/CHANGELOG.md b/CHANGELOG.md
index 93ba052512e..28d10b93720 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -57,7 +57,7 @@ We refer to [GitHub issues](https://github.com/JabRef/jabref/issues) by using `#
 - We grouped the toolbar icons and changed the Open Library and Copy icons. [#4584](https://github.com/JabRef/jabref/issues/4584) 
 - We added a browse button next to the path text field for aux-based groups. [#4586](https://github.com/JabRef/jabref/issues/4586)
 - We changed the title of Group Dialog to "Add subgroup" from "Edit group" when we select Add subgroup option.
-
+- We made modifications to improve contrast of UI elements. [#4583](https://github.com/JabRef/jabref/issues/4583)
 
 ### Fixed
 - We fixed an issue where corresponding groups are sometimes not highlighted when clicking on entries [#3112](https://github.com/JabRef/jabref/issues/3112)
diff --git a/src/main/java/org/jabref/gui/Base.css b/src/main/java/org/jabref/gui/Base.css
index 8b2cd80f7b1..642fe8dcf88 100644
--- a/src/main/java/org/jabref/gui/Base.css
+++ b/src/main/java/org/jabref/gui/Base.css
@@ -18,7 +18,7 @@
 
     -jr-white: #ffffff;
     -jr-gray-0: #f2f2f2;
-    -jr-gray-1: #e6e6e6;
+    -jr-gray-1: #dddddd;
     -jr-gray-2: #808080;
     -jr-gray-3: #404040;
     -jr-black: #000;
@@ -70,7 +70,7 @@
     -jr-error: -jr-light-red;
 
     /* Color for the small group view indicator for the number of hits */
-    -jr-group-hits-bg: derive(-jr-sidepane-background, -5%);
+    -jr-group-hits-bg: derive(-jr-sidepane-background, -50%);
     -jr-group-hits-fg: ladder(
             -jr-group-hits-bg,
             -fx-light-text-color 45%,
@@ -84,8 +84,8 @@
     -jr-tooltip-fg: -jr-black;
 
     /* Finally, some specific jr styles that depend on -fx definitions in *this* style */
-    -jr-sidepane-background: -jr-gray-0;
-    -jr-sidepane-header-background: -jr-gray-0;
+    -jr-sidepane-background: -jr-gray-1;
+    -jr-sidepane-header-background: -jr-gray-1;
     -jr-sidepane-header-color: -jr-theme-text;
 
     /* Specs for the scrollbars */
@@ -116,7 +116,7 @@
      */
     -fx-control-inner-background: derive(-fx-base, 95%);
     /* Version of -fx-control-inner-background for alternative rows */
-    -fx-control-inner-background-alt: derive(-fx-control-inner-background, -2%);
+    -fx-control-inner-background-alt: derive(-fx-control-inner-background, -6%);
 
     /* One of these colors will be chosen based upon a ladder calculation
      * that uses the brightness of a background color.  Instead of using these
diff --git a/src/main/java/org/jabref/gui/groups/GroupTree.css b/src/main/java/org/jabref/gui/groups/GroupTree.css
index 0b8b66b1928..ecee1015d44 100644
--- a/src/main/java/org/jabref/gui/groups/GroupTree.css
+++ b/src/main/java/org/jabref/gui/groups/GroupTree.css
@@ -20,7 +20,7 @@
 .numberColumn > .hits {
     -fx-font-size: 85%;
     -fx-background-color: -jr-group-hits-bg;
-    -fx-padding: 0.1em 0.4em 0.1em 0.4em;
+    -fx-padding: 0.4em 0.4em 0.4em 0.4em;
     -fx-background-insets: 0;
     -fx-background-radius: 0.8em;
 }