body { background-color: #e0e0e0; }.card { background-color: #9d9d9d; }.card-content { background-color: #9d9d9d; }.collapsible { background-color: #9d9d9d; }.collapsible-body { background-color: #9d9d9d; }.collapsible-header { background-color: #9d9d9d; }.collection-item.avatar { background-color: #9d9d9d; }nav { background-color: #717171; }.accent-color { color: #e0e0e0; }.btn-color { background-color: #717171; }