--- x.c	2020-05-07 16:51:55.080437829 +0200
+++ x.c	2020-05-07 16:51:23.850218201 +0200
@@ -812,6 +812,17 @@
 		((unsigned short)(dc.col[defaultbg].color.blue * alpha)) & 0xff00;
 	dc.col[defaultbg].pixel &= 0x00FFFFFF;
 	dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
+
+	/* set alpha value of selbg color */
+	dc.col[selectionbg].color.alpha = (unsigned short)(0xffff * alpha);
+	dc.col[selectionbg].color.red =
+		((unsigned short)(dc.col[selectionbg].color.red * alpha)) & 0xff00;
+	dc.col[selectionbg].color.green =
+		((unsigned short)(dc.col[selectionbg].color.green * alpha)) & 0xff00;
+	dc.col[selectionbg].color.blue =
+		((unsigned short)(dc.col[selectionbg].color.blue * alpha)) & 0xff00;
+	dc.col[selectionbg].pixel &= 0x00FFFFFF;
+	dc.col[selectionbg].pixel |= (unsigned char)(0xff * alpha) << 24;
 	loaded = 1;
 }