diff --git a/pelican/tests/output/basic/theme/css/main.css b/pelican/tests/output/basic/theme/css/main.css
index 01ee17d8..2efb518d 100644
--- a/pelican/tests/output/basic/theme/css/main.css
+++ b/pelican/tests/output/basic/theme/css/main.css
@@ -316,7 +316,7 @@ img.left, figure.left {float: left; margin: 0 2em 2em 0;}
 		.social a[href*='github.com'],
 		.social a[href*='git.io'] {
 			background-image: url('../images/icons/github.png');
-			background-size: 50%;
+			background-size: 16px 16px;
 		}
 		.social a[href*='gittip.com'] {background-image: url('../images/icons/gittip.png');}
 		.social a[href*='plus.google.com'] {background-image: url('../images/icons/google-plus.png');}
diff --git a/pelican/tests/output/custom/theme/css/main.css b/pelican/tests/output/custom/theme/css/main.css
index 01ee17d8..2efb518d 100644
--- a/pelican/tests/output/custom/theme/css/main.css
+++ b/pelican/tests/output/custom/theme/css/main.css
@@ -316,7 +316,7 @@ img.left, figure.left {float: left; margin: 0 2em 2em 0;}
 		.social a[href*='github.com'],
 		.social a[href*='git.io'] {
 			background-image: url('../images/icons/github.png');
-			background-size: 50%;
+			background-size: 16px 16px;
 		}
 		.social a[href*='gittip.com'] {background-image: url('../images/icons/gittip.png');}
 		.social a[href*='plus.google.com'] {background-image: url('../images/icons/google-plus.png');}
diff --git a/pelican/themes/notmyidea/static/css/main.css b/pelican/themes/notmyidea/static/css/main.css
index 01ee17d8..2efb518d 100644
--- a/pelican/themes/notmyidea/static/css/main.css
+++ b/pelican/themes/notmyidea/static/css/main.css
@@ -316,7 +316,7 @@ img.left, figure.left {float: left; margin: 0 2em 2em 0;}
 		.social a[href*='github.com'],
 		.social a[href*='git.io'] {
 			background-image: url('../images/icons/github.png');
-			background-size: 50%;
+			background-size: 16px 16px;
 		}
 		.social a[href*='gittip.com'] {background-image: url('../images/icons/gittip.png');}
 		.social a[href*='plus.google.com'] {background-image: url('../images/icons/google-plus.png');}