start dropdown grid column

css/dropdown.scss

@@ -108,7 +108,7 @@ $listMaxHeight: 210px;
             flex: 1 1 auto;
             cursor: pointer;
             font-size: $mediumSize;
-            line-height: $headerHeight;
+            // line-height: $headerHeight;
             padding: 0 6px;
             overflow: hidden;
             text-overflow: ellipsis;

css/grid.scss

@@ -207,6 +207,18 @@
                             transition: none;
                         }
                     }
+
+                    .dropdown-wrapper {
+                        height: calc(var(--line-height) + 2px);
+                        width: 100%;
+                        display: flex;
+                        flex-direction: column;
+
+                        >.dropdown-header {
+                            border: none;
+                            height: 100%;
+                        }
+                    }
                 }
             }
         }
@@ -220,6 +232,14 @@
             white-space: pre;
             display: flex;
             align-items: center;
+            visibility: hidden;
+            opacity: 0;
+            transition: visibility 0s linear .12s, opacity .12s ease;
+
+            &.active {
+                visibility: visible;
+                opacity: 1;
+            }
         }
     }