Darker background color for search suggestion options. (#8219)

Author: isoos

pkg/web_css/lib/src/_search.scss

@@ -113,7 +113,7 @@
   border: 1px solid #000;
   border-radius: 5px;
   max-height: 20em;
-  background: var(--pub-searchbar_input-background-color);
+  background: var(--pub-searchbar_suggest-background-color);
   color: var(--pub-searchbar_suggest-text-color);
   font-size: 16px;
   margin-left: 48px; // counter padding-left on .search-bar>.input

pkg/web_css/lib/src/_variables.scss

@@ -80,6 +80,7 @@
   --pub-searchbar-text-color: #8d9399;
   --pub-searchbar_input-background-color: #35404d;
   --pub-searchbar_input-text-color: var(--pub-color-white);
+  --pub-searchbar_suggest-background-color: #25303d;
   --pub-searchbar_suggest_hover-background-color: #455060;
   --pub-searchbar_suggest-text-color: #a9a9a9;
   --pub-session_warning-background-color: #ffffaa;