Remove outline on textbox

Screenshot: https://imgur.com/a/pw7BUcu

Change-Id: I549e570f027bf50e4fc4d576bdcd57965d023828

web/element/extensions.ts

diff --git a/web/element/extensions.ts b/web/element/extensions.ts
index 64b998c..6c2be75 100644
--- a/web/element/extensions.ts
+++ b/web/element/extensions.ts
@@ -47,6 +47,9 @@
         color: 'var(--deemphasized-text-color)',
         'background-color': 'var(--background-color-secondary)',
       },
+      '&.cm-editor.cm-focused': {
+        outline: 'none'
+      },
     },
     {dark}
   );