diff --git a/platform/org.eclipse.platform/book.css b/platform/org.eclipse.platform/book.css
index d91cb7a..65cba90 100644
--- a/platform/org.eclipse.platform/book.css
+++ b/platform/org.eclipse.platform/book.css
@@ -132,4 +132,13 @@
 	a:hover{
 		color: #f0f0f0;
 	}
+	
+	/* darken images to add some comfort while reading in dark theme */
+	img {
+		opacity: .75;
+		transition: opacity .5s ease-in-out;
+	}
+	img:hover {
+		opacity: 1;
+	}
 }
diff --git a/platform/org.eclipse.platform/macosx_narrow_book.css b/platform/org.eclipse.platform/macosx_narrow_book.css
index cf531f0..d53efe4 100644
--- a/platform/org.eclipse.platform/macosx_narrow_book.css
+++ b/platform/org.eclipse.platform/macosx_narrow_book.css
@@ -4,4 +4,13 @@
 	h1, h2{
 		color: #f0f0f0;
 	}
+	
+	/* darken images to add some comfort while reading in dark theme */
+	img {
+		opacity: .75;
+		transition: opacity .5s ease-in-out;
+	}
+	img:hover {
+		opacity: 1;
+	}
 }
\ No newline at end of file
diff --git a/platform/org.eclipse.platform/narrow_book.css b/platform/org.eclipse.platform/narrow_book.css
index dc3578f..78c52b1 100644
--- a/platform/org.eclipse.platform/narrow_book.css
+++ b/platform/org.eclipse.platform/narrow_book.css
@@ -139,4 +139,13 @@
 	a:hover{
 		color: #f0f0f0;
 	}
+	
+	/* darken images to add some comfort while reading in dark theme */
+	img {
+		opacity: .75;
+		transition: opacity .5s ease-in-out;
+	}
+	img:hover {
+		opacity: 1;
+	}
 }
diff --git a/platform/org.eclipse.sdk/macosx_narrow_book.css b/platform/org.eclipse.sdk/macosx_narrow_book.css
index cf531f0..d53efe4 100644
--- a/platform/org.eclipse.sdk/macosx_narrow_book.css
+++ b/platform/org.eclipse.sdk/macosx_narrow_book.css
@@ -4,4 +4,13 @@
 	h1, h2{
 		color: #f0f0f0;
 	}
+	
+	/* darken images to add some comfort while reading in dark theme */
+	img {
+		opacity: .75;
+		transition: opacity .5s ease-in-out;
+	}
+	img:hover {
+		opacity: 1;
+	}
 }
\ No newline at end of file
diff --git a/platform/org.eclipse.sdk/narrow_book.css b/platform/org.eclipse.sdk/narrow_book.css
index 5a98aec..b18fce9 100644
--- a/platform/org.eclipse.sdk/narrow_book.css
+++ b/platform/org.eclipse.sdk/narrow_book.css
@@ -140,4 +140,12 @@
 		color: #f0f0f0;
 	}
 
+	/* darken images to add some comfort while reading in dark theme */
+	img {
+		opacity: .75;
+		transition: opacity .5s ease-in-out;
+	}
+	img:hover {
+		opacity: 1;
+	}
 }