diff --git a/kallithea/public/less/kallithea-diff.less b/kallithea/public/less/kallithea-diff.less
--- a/kallithea/public/less/kallithea-diff.less
+++ b/kallithea/public/less/kallithea-diff.less
@@ -183,6 +183,7 @@ BIN_FILENODE = 6
   background: @kallithea-theme-main-color;
   width: 16px;
   height: 16px;
+  line-height: 14px;
   cursor: pointer;
   padding: 0 2px 2px 0.5px;
   border: 1px solid @kallithea-theme-main-color;