Implement react-basics styles. Fix queries.

components/common/Modal.module.css

@@ -25,12 +25,12 @@
   top: 50%;
   left: 50%;
   transform: translate(-50%, -50%);
-  background: var(--gray50);
+  background: var(--base50);
   min-width: 400px;
   min-height: 100px;
   max-width: 100vw;
   z-index: 1;
-  border: 1px solid var(--gray300);
+  border: 1px solid var(--base300);
   padding: 30px;
   border-radius: 4px;
 }