diff --git a/core/src/main/java/org/jsmart/zerocode/core/constants/ZeroCodeReportConstants.java b/core/src/main/java/org/jsmart/zerocode/core/constants/ZeroCodeReportConstants.java
index 855e4a22..c296ddc2 100644
--- a/core/src/main/java/org/jsmart/zerocode/core/constants/ZeroCodeReportConstants.java
+++ b/core/src/main/java/org/jsmart/zerocode/core/constants/ZeroCodeReportConstants.java
@@ -21,4 +21,9 @@ public interface ZeroCodeReportConstants {
     String ZEROCODE_JUNIT = "zerocode.junit";
     String CHARTS_AND_CSV = "gen-smart-charts-csv-reports";
 
+    // Custom js and css for extent report
+    String EXTENT_ADDITIONAL_JS = "document.querySelector('.vheader').insertAdjacentHTML('afterbegin'," +
+            "'<div id=\"theme-selector\"class=\"nav-right\"onClick=$(\"body\").toggleClass(\"dark\")>" +
+            "<span class=\"badge badge-primary\"><i class=\"fa fa-desktop\"></i></span></div>')";
+    String EXTENT_ADDITIONAL_CSS = "#theme-selector{padding-right:12px;padding-left:12px;margin-right:10px}";
 }
diff --git a/core/src/main/java/org/jsmart/zerocode/core/domain/builders/ExtentReportsFactory.java b/core/src/main/java/org/jsmart/zerocode/core/domain/builders/ExtentReportsFactory.java
index 434cf559..cad3a229 100644
--- a/core/src/main/java/org/jsmart/zerocode/core/domain/builders/ExtentReportsFactory.java
+++ b/core/src/main/java/org/jsmart/zerocode/core/domain/builders/ExtentReportsFactory.java
@@ -8,6 +8,8 @@
 import java.util.Properties;
 import java.util.Set;
 
+import static org.jsmart.zerocode.core.constants.ZeroCodeReportConstants.EXTENT_ADDITIONAL_CSS;
+import static org.jsmart.zerocode.core.constants.ZeroCodeReportConstants.EXTENT_ADDITIONAL_JS;
 import static org.jsmart.zerocode.core.constants.ZeroCodeReportConstants.REPORT_DISPLAY_NAME_DEFAULT;
 import static org.jsmart.zerocode.core.constants.ZeroCodeReportConstants.REPORT_TITLE_DEFAULT;
 import static org.slf4j.LoggerFactory.getLogger;
@@ -56,7 +58,8 @@ public static void attachSystemInfo() {
     public static ExtentSparkReporter createExtentHtmlReporter(String reportFileName) {
         extentSparkReporter = new ExtentSparkReporter(reportFileName);
 
-
+        extentSparkReporter.config().setJs(EXTENT_ADDITIONAL_JS);
+        extentSparkReporter.config().setCss(EXTENT_ADDITIONAL_CSS);
         extentSparkReporter.config().setDocumentTitle(REPORT_TITLE_DEFAULT);
         extentSparkReporter.config().setReportName(REPORT_DISPLAY_NAME_DEFAULT);