Fix Quiz dark mode #803

Job	Run time
Build-environments (jupyter-book/introduction/analysis_tools.yml)	38s
Build-environments (jupyter-book/preprocessing_visualization/preprocessing.yml)	1m 1s
Build-environments (jupyter-book/cellular_structure/clustering.yml)	41s
Build-environments (jupyter-book/cellular_structure/annotation.yml)	2m 8s
Build-environments (jupyter-book/cellular_structure/integration.yml)	1m 17s
Build-environments (jupyter-book/conditions/compositional.yml)	4m 14s
Build-environments (jupyter-book/conditions/gsea_pathway.yml)	1m 0s
Build-environments (jupyter-book/conditions/perturbation_modeling.yml)	2m 35s
Build-environments (jupyter-book/conditions/differential_gene_expression.yml)	2m 37s
Build-environments (jupyter-book/trajectories/lineage_tracing.yml)	1m 33s
Build-environments (jupyter-book/trajectories/pseudotemporal.yml)	34s
Build-environments (jupyter-book/mechanisms/cell_cell_communication.yml)	1m 12s
Build-environments (jupyter-book/spatial/spatial.yml)	15m 24s
Build-environments (jupyter-book/surface_protein/surface_protein.yml)	32s
Build-environments (jupyter-book/multimodal_integration/paired_integration.yml)	2m 37s
Build-environments (jupyter-book/multimodal_integration/advanced_integration.yml)	2m 55s
	40m 58s

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