[Media Router WebUI] Fix non-blocking issue banner styling.

chrome/browser/resources/media_router/elements/issue_banner/issue_banner.css

Index: chrome/browser/resources/media_router/elements/issue_banner/issue_banner.css
diff --git a/chrome/browser/resources/media_router/elements/issue_banner/issue_banner.css b/chrome/browser/resources/media_router/elements/issue_banner/issue_banner.css
index 9730fa99f823beeef33611cf7627a2c1797ac4af..ca6f86b7b05975283a377f765ed2c73a061a21d6 100644
--- a/chrome/browser/resources/media_router/elements/issue_banner/issue_banner.css
+++ b/chrome/browser/resources/media_router/elements/issue_banner/issue_banner.css
@@ -32,6 +32,7 @@
   background-color: var(--paper-grey-800);
   overflow: hidden;
   padding: 16px;
+  width: inherit;
 }
 
 .non-blocking > #buttons {
@@ -41,6 +42,10 @@
   width: 100%;
 }
 
+.non-blocking > #buttons > #default-button {
+  -webkit-margin-end: 24px;
+}
+
 .non-blocking > div > #title {
   color: rgba(255, 255, 255, 0.87);
 }