Shimless: spacing for landing page navigation buttons

https://screenshot.googleplex.com/9oerQRDr7fcTseF

Bug: 1198187
Test: local
Change-Id: Ia382b26edb1d59c2032d601c18aeba79987fac46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3561746
Reviewed-by: Gavin Williams <gavinwill@chromium.org>
Commit-Queue: Anton Swifton <swifton@google.com>
Cr-Commit-Position: refs/heads/main@{#987321}

ash/webui/shimless_rma/resources/onboarding_landing_page.html

@@ -7,6 +7,15 @@
   #nextButtonCaret {
     margin-inline-start: 5px;
   }
+
+  #navigationButtonWrapper {
+    bottom: var(--footer-height);
+    position: absolute;
+  }
+
+  #getStartedButton {
+    margin-inline-end: 8px;
+  }
 </style>
 
 <base-page>
@@ -33,20 +42,22 @@ <h1>[[i18n('welcomeTitleText')]]</h1>
         </span>
       </span>
     </div>
-    <cr-button id="getStartedButton" class="action-button"
-        on-click="onGetStartedButtonClicked_"
-        disabled="[[isGetStartedButtonDisabled_(verificationInProgress_,
-        allButtonsDisabled)]]">
-      [[i18n('getStartedButtonLabel')]]
-      <span id="nextButtonCaret">&#62;</span>
-    </cr-button>
-    <cr-button id="landingCancel" class="pill"
-        on-click="onLandingCancelButtonClicked_"
-        disabled="[[allButtonsDisabled]]">
-      <span id="cancelButtonLabel">
-        [[i18n('cancelButtonLabel')]]
-      </span>
-    </cr-button>
+    <div id="navigationButtonWrapper">
+      <cr-button id="getStartedButton" class="action-button"
+          on-click="onGetStartedButtonClicked_"
+          disabled="[[isGetStartedButtonDisabled_(verificationInProgress_,
+          allButtonsDisabled)]]">
+        [[i18n('getStartedButtonLabel')]]
+        <span id="nextButtonCaret">&#62;</span>
+      </cr-button>
+      <cr-button id="landingCancel" class="pill"
+          on-click="onLandingCancelButtonClicked_"
+          disabled="[[allButtonsDisabled]]">
+        <span id="cancelButtonLabel">
+          [[i18n('cancelButtonLabel')]]
+        </span>
+      </cr-button>
+    </div>
   </div>
   <div slot="right-pane">
     <div class="illustration-wrapper">