add html, body style

@@ -3,6 +3,13 @@ import reset from "styled-reset";
 
 export default createGlobalStyle`
     ${reset}
+    html {
+        box-sizing: border-box;
+        font-size: 16px;
+    }
+    body {
+        max-width: 100%;
+    }
     li {
         list-style: none;
     }