Reversed button cleanup for light theme

src/css/less/bootswatch.light.less

@@ -317,6 +317,9 @@ div.subnav {
 	}
 }
 
+.btn-inverse {
+}
+
 .btn-large {
 	padding: 22px 30px;
 }

src/css/less/variables.light.less

@@ -29,7 +29,7 @@
 @orange:                #FF7518;
 @pink:                  #E671B8;
 @purple:                #9954BB;
-@variable:              #32D1DF;
+@variable:              #2AB2E4;
 
 // grafana Variables
 // -------------------------
@@ -143,8 +143,8 @@
 @btnDangerBackground:               lighten(@red, 5%);
 @btnDangerBackgroundHighlight:      darken(@red, 5%);
 
-@btnInverseBackground:              lighten(@black, 5%);
-@btnInverseBackgroundHighlight:     darken(@black, 5%);
+@btnInverseBackground:              @gray;
+@btnInverseBackgroundHighlight:     darken(@gray, 10%);
 
 @iconContainerBackground:			@white;
 @iconContainerBackgroundHighlight:	lighten(@white, 5%);