Fixes broken nested tables in module docs (#36144)

(cherry picked from commit dc902a5022)

docs/docsite/_themes/sphinx_rtd_theme/static/css/theme.css

@@ -422,6 +422,58 @@ table {
 }
 
 
+.outer-elbow-container {
+    display: flex;
+    height: 100%;
+    flex-direction: row;
+}
+
+.elbow-placeholder {
+    border-left: 1px solid #000;
+    height: 100%;
+    width: 30px;
+}
+
+.elbow-key {
+    height: 100%;
+    padding: 4px;
+    border-top: 1px solid #000;
+    flex-grow: 1;
+    border-left: 1px solid #000;
+}
+
+.elbow-blocker {
+    height: 0;
+    overflow: hidden;
+}
+
+.return-value-column {
+    height: 1px
+}
+
+.return-value-column td {
+    height: inherit
+}
+
+@-moz-document url-prefix() {
+    .return-value-column td {
+        height: 100%
+    }
+}
+
+.cell-border {
+    padding: 4px;
+    border-left: 1px solid #000;
+    border-top: 1px solid #000;
+    height: 100%;
+}
+
+.documentation-table {
+    border-right: 1px solid #000;
+    border-bottom: 1px solid #000;
+}
+
+
 @media print {
     * { background: transparent !important; color: black !important; text-shadow: none !important; filter:none !important; -ms-filter: none !important; }