refactor: style 중복 선언 제거

Resolve: #54

Author: dohun31

client/src/pages/Loading/style.module.scss

@@ -5,10 +5,3 @@
   width: 100vw;
   height: 100vh;
 }
-.container {
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  width: 100vw;
-  height: 100vh;
-}