[NTP] Mobile friendly buttons on snippets internals.

chrome/browser/resources/snippets_internals.css

Index: chrome/browser/resources/snippets_internals.css
diff --git a/chrome/browser/resources/snippets_internals.css b/chrome/browser/resources/snippets_internals.css
index 92a97699e2e4bce327c549b249a227500e36b9c6..e84d84cc8e5c6342bb14e20347308093d9ac9742 100644
--- a/chrome/browser/resources/snippets_internals.css
+++ b/chrome/browser/resources/snippets_internals.css
@@ -78,3 +78,14 @@ td.title-link {
   padding: 4px;
   word-break: break-all;
 }
+
+button {
+  min-height: 30px;
+}
+
+.vertical-buttons > button {
+  float: left;
+  margin-right: 5px;
+  max-width: 100px;
+  min-height: 40px;
+}