diff --git a/src/ColumnsBlock/styles.less b/src/ColumnsBlock/styles.less
index 234666c..145133b 100644
--- a/src/ColumnsBlock/styles.less
+++ b/src/ColumnsBlock/styles.less
@@ -43,7 +43,7 @@
       margin-bottom: 1.5em;
 
       .block.selected::before {
-        border-top-right-radius: 0;
+        border-top-left-radius: 0;
       }
 
       .block-add-button {
@@ -103,8 +103,7 @@
   }
 
   .blocks-chooser {
-    right: 0;
-    left: unset;
+    left: 0;
     margin-top: 50px;
   }
 }
@@ -128,7 +127,7 @@
 .block-toolbar {
   position: absolute;
   z-index: 3;
-  right: -9px;
+  left: -9px;
   display: flex;
   padding: 5px;
   border: none;