nextcloud-breeze-dark/core/css/apps/_quicknotes.scss

.app-quicknotes {

    #app-navigation {

        #new-note-fixed {
            background-color: $background-normal;
            padding: 9px;
            margin: 1px;
        }

        #colors-folder {

            .icon-checkmark {
                background-image: url('/core/css/../img/actions/checkmark.svg?v=1');
            }

            .circle-toolbar.any-color {
                background-color: $background-alternate;
            }
        }

        #notes-folder {

            .note a {
                color: $foreground-normal;
                opacity: 0.7;
            }
        }
    }

    .quicknote {
        color: #000000;
        box-shadow: none;

        .icon-checkmark {
            background-image: url('/core/css/../img/actions/checkmark.svg?v=1');
        }
    
        .icon-delete {
            background-image: url('/core/css/../img/actions/delete.svg?v=1');
    
            &:hover, &:focus {
                background-image: url('/core/css/../img/actions/delete-hover.svg?v=1');
            }
        }
    }
}