Improve error boundary styles, provide way to clear browser data

app/styles/components/error-boundary.scss

@@ -1,4 +1,22 @@
 .error-boundary {
+  box-sizing: border-box;
+  min-height: 100vh;
+  max-width: 375px;
+  text-align: center;
+  padding: 10px 10px 80px;
+
+  i.fa.fa-frown-o {
+    display: block;
+    text-align: center;
+    font-size: 70px;
+    margin-bottom: 20px;
+    opacity: 0.5;
+  }
+
+  a {
+    color: var(--brand-color);
+  }
+
   > div {
     margin: auto;
 
@@ -8,11 +26,20 @@
       color: var(--primary-text-color--faint);
     }
 
-    a {
+    a.return-home {
       display: block;
       margin: 15px auto;
       text-align: center;
-      color: var(--brand-color);
     }
   }
+
+  p.help-text {
+    text-align: left;
+    font-style: italic;
+    font-size: 14px;
+    padding: 20px 10px 0;
+    margin-top: 70px;
+    opacity: 0.7;
+    border-top: 1px solid;
+  }
 }