手机计算器界面设计：白色背景、深色屏幕与白色文字

"{\n \"tokens\": {\n \"colors\": {\n \"background\": \"#FFFFFF\",\n \"screenBackground\": \"#333333\",\n \"screenText\": \"#FFFFFF\"\n },\n \"typography\": {\n \"body\": {\n \"fontSize\": \"14px\",\n \"fontWeight\": \"400\"\n }\n },\n \"rounded\": {\n \"sm\": \"4px\"\n },\n \"spacing\": {\n \"sm\": \"8px\"\n }\n },\n \"component\": \"div\",\n \"layout\": {\n \"display\": \"flex\",\n \"justifyContent\": \"center\",\n \"alignItems\": \"center\",\n \"width\": \"100%\",\n \"height\": \"100%\"\n },\n \"backgroundColor\": \"{colors.background}\",\n \"children\": [\n {\n \"component\": \"div\",\n \"layout\": {\n \"position\": \"relative\"\n },\n \"width\": \"120px\",\n \"height\": \"60px\",\n \"borderRadius\": \"{rounded.sm}\",\n \"backgroundColor\": \"{colors.screenBackground}\",\n \"_uncertain\": true\n }\n ]\n}"