diff --git a/theme.css b/theme.css
index 76f85b8..e2c2c6c 100644
--- a/theme.css
+++ b/theme.css
@@ -18,29 +18,27 @@
   flex-wrap: wrap;
 }
 
-.board-column:first-child {
-  margin-left: 0 !important;
-}
-
 .board-column {
   margin-bottom: .5rem !important;
-  width: 25%;
+  margin-left: .5rem !important;
+  margin-right: .5rem !important;
+  width: calc(25% - 2 * 0.rem);
 }
 
 @media screen and (max-width: 992px) {
 	.board-colomn {
-		width: 33%;
+        width: calc(33% - 2 * 0.rem);
 	}
 }
 
 @media screen and (max-width: 640px) {
 	.board-colomn {
-		width: 50%;
+        width: calc(50% - 2 * 0.rem);
 	}
 }
 
 @media screen and (max-width: 420px) {
 	.board-colomn {
-		width: 100%;
+        width: calc(100% - 2 * 0.rem);
 	}
 }