docs: update CSS for console code block

Author: kenjis

user_guide_src/source/_static/css/citheme.css

@@ -241,6 +241,10 @@ html.writer-html5 .rst-content dl[class]:not(.option-list):not(.field-list):not(
 	margin-top: 2rem;
 }
 
+.highlight-console .highlight {
+    background-color: #fffff0;
+}
+
 /* Messages ----------------------------------------------------------------- */
 
 .rst-content .success {

user_guide_src/source/_static/css/citheme_dark.css

@@ -343,4 +343,8 @@
     .highlight .ni {
         color: #b780b7;
     }
+
+    .highlight-console .highlight pre {
+        background: #434343;
+    }
 }