diff --git a/kallithea/front-end/kallithea-diff.less b/kallithea/front-end/kallithea-diff.less
--- a/kallithea/front-end/kallithea-diff.less
+++ b/kallithea/front-end/kallithea-diff.less
@@ -174,18 +174,18 @@ BIN_FILENODE = 6
 }
 .add-bubble div {
   background: @kallithea-theme-main-color;
-  width: 16px;
-  height: 16px;
-  line-height: 14px;
+  width: 1.2em;
+  height: 1.2em;
+  line-height: 1em;
   cursor: pointer;
-  padding: 0 2px 2px 0.5px;
+  padding: 0.1em 0.1em 0.1em 0.12em;
   border: 1px solid @kallithea-theme-main-color;
-  border-radius: 3px;
+  border-radius: 0.2em;
   box-sizing: border-box;
   overflow: hidden;
 }
 .add-bubble div:before {
-  font-size: 14px;
+  font-size: 1em;
   color: #ffffff;
   font-family: "kallithea";
   content: '\1f5ea';