fix centering of edge-aligned controls

1 files changed, 4 insertions, 0 deletions

diff --git a/css/reveal.scss b/css/reveal.scss
index 689aa40..4a953fd 100644
--- a/css/reveal.scss
+++ b/css/reveal.scss
@@ -477,21 +477,25 @@ $controlsArrowAngleActive: 36deg;
 		.navigate-left {
 			top: 50%;
 			left: $spacing;
+			margin-top: -$controlArrowSize/2;
 		}
 
 		.navigate-right {
 			top: 50%;
 			right: $spacing;
+			margin-top: -$controlArrowSize/2;
 		}
 
 		.navigate-up {
 			top: $spacing;
 			left: 50%;
+			margin-left: -$controlArrowSize/2;
 		}
 
 		.navigate-down {
 			bottom: $spacing;
 			left: 50%;
+			margin-left: -$controlArrowSize/2;
 		}
 	}