diff --git a/src/styles/components/tree.less b/src/styles/components/tree.less
index 60a4363..0d9a37e 100644
--- a/src/styles/components/tree.less
+++ b/src/styles/components/tree.less
@@ -38,7 +38,10 @@
     }
     &-arrow{
         cursor: pointer;
-        i{
+        width: 12px;
+        text-align: center;
+        display: inline-block;
+        i {
             transition: all @transition-time @ease-in-out;
         }
         &-open{
@@ -56,4 +59,4 @@
             cursor: @cursor-disabled;
         }
     }
-}
\ No newline at end of file
+}
--
libgit2 0.21.4