DEFAULT_CSS = '\n AssistantMessage {\n height: auto;\n padding: 0 1;\n margin: 0 0 1 0;\n }\n\n AssistantMessage Markdown {\n padding: 0;\n margin: 0;\n pointer: text;\n }\n\n /* Markdown blocks carry a bottom margin for inter-block spacing; drop it\n on the final block so the message has no trailing blank row. */\n AssistantMessage Markdown > *:last-child {\n margin-bottom: 0;\n }\n '