diff --git a/less/buttons.less b/less/buttons.less
index 9c808ba..6a2580a 100644
--- a/less/buttons.less
+++ b/less/buttons.less
@@ -13,7 +13,7 @@ button {
 	cursor: pointer;
 	border: none;
 	&.btn-a {
-		background: #0AE;
+		background: #0ae;
 		&:hover {
 			background: #09d; /* darken(@btn-a-bg, 5%) */
 		}
@@ -22,7 +22,7 @@ button {
 		}
 	}
 	&.btn-b {
-		background: #3C5;
+		background: #3c5;
 		&:hover {
 			background: #2b4; /* darken(@btn-b-bg, 5%) */
 		}
@@ -31,9 +31,9 @@ button {
 		}
 	}
 	&.btn-c {
-		background: #D33;
+		background: #d33;
 		&:hover {
-			background: #d22; /* darken(@btn-c-bg, 5%) */
+			background: #c22; /* darken(@btn-c-bg, 5%) */
 		}
 		&:active {
 			background: #b22; /* darken(@btn-c-bg, 10%) */