[Feat/#8] 공통 레이아웃 설정

src/app/global.css

@@ -0,0 +1,15 @@
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
+}
+
+body {
+  word-break: break-all;
+}
+
+@media screen and (min-width: 450px) {
+  body {
+    background-color: rgb(245, 245, 245);
+  }
+}

src/app/layout.tsx

@@ -1,3 +1,4 @@
+import '@/app/global.css';
 import ResponsiveRootLayout from '@/shared/components/ResponsiveRootLayout';
 import ReactQueryClientProvider from '@/shared/lib/reactQuery/ReactQueryClientProvider';
 import StyledComponentsRegistry from '@/shared/lib/styledComponents/StyledComponentsRegistry';