OOBE: Adapt enrollment css

TBR=antrim@chromium.org

Bug: 1000608
Change-Id: I4cdaaf6ca1699d8d9b861b8b8789c34f256245e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795823Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695956}

chrome/browser/resources/chromeos/login/enterprise_enrollment.css

@@ -14,12 +14,16 @@
   display: none;
 }
 
-#oauth-enroll-step-contents {
-  color: #666;
+#oauth-enroll-step-contents,
+#oauth-enroll-step-contents > div {
   height: 100%;
   width: 100%;
 }
 
+#oauth-enroll-step-contents {
+  color: #666;
+}
+
 #step-error {
   display: table;
   height: 480px;
@@ -28,10 +32,10 @@
 
 #oauth-enroll-auth-view {
   display: block;
-  height: 560px;
+  height: 100%;
   overflow: hidden;
   padding: 0;
-  width: 768px;
+  width: 100%;
 }
 
 #oauth-enroll-learn-more-link {