Style codeblock :caption: (#288)

Co-authored-by: Petr Viktorin <encukou@gmail.com>

Author: StanFromIreland

python_docs_theme/static/pydoctheme.css

@@ -247,6 +247,25 @@ div.body {
     }
 }
 
+div.code-block-caption {
+    background-color: #eee;
+    border: 1px solid #ac9;
+    border-bottom: none;
+    border-radius: 3px 3px 0 0;
+    padding: 0.3em 0.6em;
+    font-size: 90%;
+    color: #333;
+
+    & + div pre {
+        border-top-left-radius: 0 !important;
+        border-top-right-radius: 0 !important;
+    }
+
+    & + div .copybutton {
+        border-top-right-radius: 0 !important;
+    }
+}
+
 /* Admonitions */
 :root {
     --admonition-background: #eee;

python_docs_theme/static/pydoctheme_dark.css

@@ -97,6 +97,12 @@ div.body pre {
     border-color: #616161;
 }
 
+div.code-block-caption {
+    background-color: #333;
+    border-color: #616161;
+    color: white;
+}
+
 code {
     background-color: #424242;
 }