fix duplicate styling (#67)

packages/frontend/src/components/shared/Calendar/Calendar.css

@@ -30,7 +30,7 @@ abbr[title] {
   @apply !text-elements-disabled !bg-transparent;
 }
 
-.react-calendar__month-view__days__day--neighboringMonth {
+.react-calendar__month-view__days__day--neighboringMonth:focus-visible {
   @apply !text-elements-disabled !bg-transparent;
 }
 

packages/frontend/tailwind.config.js

@@ -14,9 +14,6 @@ export default withMT({
         xxs: '400px',
         xs: '480px',
       },
-      zIndex: {
-        tooltip: '52',
-      },
       letterSpacing: {
         tight: '-0.084px',
       },
@@ -178,6 +175,7 @@ export default withMT({
         4.5: '1.125rem',
       },
       zIndex: {
+        tooltip: '52',
         toast: '9999',
       },
       animation: {