body { background-color: #686868; }.card { background-color: #9a9a9a; }.card-content { background-color: #9a9a9a; }.collapsible { background-color: #9a9a9a; }.collapsible-body { background-color: #9a9a9a; }.collapsible-header { background-color: #9a9a9a; }.collection-item.avatar { background-color: #9a9a9a; }nav { background-color: #686868; }.accent-color { color: #d8d8d8; }.btn-color { background-color: #dadada; }