怎么修改hornil幻灯片的背景颜色？

[[{"txt": "\u8981\u4fee\u6539hornil\u5e7b\u706f\u7247\u7684\u80cc\u666f\u989c\u8272\u5f88\u7b80\u5355\u3002"}, {"img": ["https://exp-picture.cdn.bcebos.com/5c9c964ce54a2f27c87cd9b5e00192dd3240f42a.m2m?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_500%2Climit_1"]}], [{"txt": ["\u5de5\u5177/\u539f\u6599"]}, {"txt": "hornil"}, {"txt": "\u7535\u8111"}], [{"txt": ["\u65b9\u6cd5/\u6b65\u9aa4"]}, {"txt": "1.\u9996\u5148\u6253\u5f00\u56fe\u50cf\u5904\u7406\u8f6f\u4ef6\u3002"}, {"img": ["https://exp-picture.cdn.bcebos.com/939c2d40b6f39187358f687324fce186252fef2a.m2m?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_500%2Climit_1"]}, {"txt": "2.\u7136\u540e\u70b9\u51fb\u4e0a\u9762\u7684\u89c6\u56fe\u83dc\u5355\u3002\u53ec\u6e29\u8ffd\u80a4"}, {"img": ["https://exp-picture.cdn.bcebos.com/e0c73a2fa872941f8377c5697b5e4a237871e62a.m2m?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_500%2Climit_1"]}, {"txt": "3.\u70b9\u51fb\u540e\u51fa\u73b0\u4e0b\u62c9\u6846\uff0c\u9009\u4e89\u5c48\u56fd\u62e9options\u3002"}, {"img": ["https://exp-picture.cdn.bcebos.com/f11f54237971fe1dd54be9aaea20a7cd0d6ee02a.m2m?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_500%2Climit_1"]}, {"txt": "4.\u6700\u540e\u5728options\u8bbe\u7f6e\u6846\u91cc\u5c31\u80fd\u4fee\u6539\u5e7b\u706f\u7247\u80cc\u666f\u989c\u8272\u4e86\u3002"}, {"img": ["https://exp-picture.cdn.bcebos.com/6061b9cd0c6efbf24b208464127bbbf4db58da2a.m2m?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_500%2Climit_1"]}], [{"txt": ["\u6ce8\u610f\u4e8b\u9879"]}, {"txt": "\u591a\u591a\u7ec3\u4e60"}, {"txt": "\u4e0d\u61c2\u5c31\u95ee"}]]