night mode code display

frontend/src/metabase/css/dashboard.css

@@ -345,3 +345,8 @@
 .Dashboard--night .goal .line {
   stroke: white;
 }
+
+/* when in night mode code snippets should have a more readable background-color */
+.Dashboard--night pre code {
+  background-color: rgba(255, 255, 255, 0.14);
+}

frontend/src/metabase/visualizations/visualizations/Text.css

@@ -140,6 +140,7 @@
   line-height: 20px;
   padding: 0 .25em;
   background-color: var(--base-grey);
+  border-radius: var(--default-border-radius);
 }
 
 :local .text-card-markdown pre code {