nextcloud-breeze-dark/css/apps/thirdparty/_circles.scss

/* Circles ------------------------------------------------------------------ */

.app-circles #circle-navigation {
    border: none;

    input,
    select,
    option {
        background-color: var(--color-background-darker) !important;
    }

    select#circles_filters {
        color: var(--color-main-text);
    }

    &.selected {
        background-color: var(--color-background-darker) !important;
        border-right: 1px solid var(--color-border);
    }

    &.circles .circle {
        border-bottom-color: var(--color-border);

        &:hover {
            background-color: var(--color-background-hover);
        }

        .title,
        .type,
        .owner {
            color: var(--color-main-text);
        }

        &.selected {
            background-color: var(--color-primary-element);
        }
    }

    #circles_list {

        div {
            color: var(--color-main-text);
            border-color: var(--color-border);
            background-color: var(--color-main-background);
            
            &:hover {
                background: var(--color-background-hover);
            }
        }
    
        .selected {
            background: var(--color-primary-element) !important;
        }
    }

    #circles_new_type_definition div {
        color: var(--color-main-text);
    }
}

.app-circles #app-content {

    #mainui {

        #circle_details {
    
            #name {
                color: var(--color-text-active);
            }
    
            #type {
                color: var(--color-main-text);
            }
    
            .lightenbg {
                background: var(--color-primary-element);
            }
        }
    
        #memberslist .entry td {
            color: var(--color-main-text);
            background: var(--color-main-background) !important;
            border-bottom-color: var(--color-border);
        }

        #members_search_result {
            border-color: var(--color-border);
            color: var(--color-main-text);
            background: var(--color-main-background);
            
            .members_search.exact {
                background-color: var(--color-background-hover);
            }
        }

        #settings-panel #settings-table {
            color: var(--color-main-text);

            tbody tr {
                opacity: 1 !important;
            }
        }
    }
}

#app-content-circlesfilter .select2-container .select2-choices {
    background-color: var(--color-main-background);
    border-color: var(--color-border);
}