small bug fixes

components/header.js

@@ -222,7 +222,7 @@ function NavItems ({ className, sub, prefix }) {
                 asPath = `/~${sub}` + router.asPath
               } else {
                 // otherwise, just go to the sub
-                router.push(`/~${sub}`)
+                router.push(sub ? `/~${sub}` : '/')
                 return
               }
             }

styles/globals.scss

@@ -209,7 +209,7 @@ $btn-close-bg: none;
   background-color: transparent;
 }
 .modal-body.fullscreen {
-  width: 100%;
+  width: 100vw;
   height: calc(100svh - 6rem);
   padding: 0;
   background-color: transparent;