Add syntax highlighting for bash.

default_environment/stylesheet/language_bash.css

@@ -0,0 +1,39 @@
+:root {
+  --srclg-bash-srchl-comment-color: #048a81;
+  --srclg-bash-srchl-function-color: #e95a62;
+  --srclg-bash-srchl-keyword-color: #1a936f;
+  --srclg-bash-srchl-property-color: inherit;
+  --srclg-bash-srchl-string-color: #ecc30b;
+}
+
+@media (prefers-color-scheme: light) {
+  :root {
+    --srclg-bash-srchl-comment-color: #fb757e;
+    --srclg-bash-srchl-function-color: #16a59d;
+    --srclg-bash-srchl-keyword-color: #e56c90;
+    --srclg-bash-srchl-property-color: inherit;
+    --srclg-bash-srchl-string-color: #133cf4;
+  }
+}
+
+.main_content {
+  .src_block {
+    &.srclg_bash {
+      .srchl_comment {
+        color: var(--srclg-bash-srchl-comment-color);
+      }
+      .srchl_function {
+        color: var(--srclg-bash-srchl-function-color);
+      }
+      .srchl_keyword {
+        color: var(--srclg-bash-srchl-keyword-color);
+      }
+      .srchl_property {
+        color: var(--srclg-bash-srchl-property-color);
+      }
+      .srchl_string {
+        color: var(--srclg-bash-srchl-string-color);
+      }
+    }
+  }
+}