diff --git a/public_html/css/header.scss b/public_html/css/header.scss
index 52ae6b5..275136a 100755
--- a/public_html/css/header.scss
+++ b/public_html/css/header.scss
@@ -9,7 +9,7 @@
 			top: 0;
 			left: 0;
 			width: $menu-side-width;
-			height: $menu-side-width;
+			height: calc( #{$menu-side-width} - 1px );
 
 		background-color: darken($theme-color, 10);
 		background-image: url('/src/static/iconv3.svg');
diff --git a/public_html/css/min/header.css b/public_html/css/min/header.css
index d74f393..3344c59 100644
--- a/public_html/css/min/header.css
+++ b/public_html/css/min/header.css
@@ -11,7 +11,7 @@
     top: 0;
     left: 0;
     width: 4em;
-    height: 4em;
+    height: calc( 4em - 1px);
     background-color: #c23f05;
     background-image: url("/src/static/iconv3.svg");
     background-position: center center;