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Simple table designed in gt() 
  library(gt)
  library(palmerpenguins)
  library(dplyr)

## 
## Attaching package: 'dplyr'

## The following objects are masked from 'package:stats':
## 
##     filter, lag

## The following objects are masked from 'package:base':
## 
##     intersect, setdiff, setequal, union

  names(penguins)

## [1] "species"           "island"            "bill_length_mm"   
## [4] "bill_depth_mm"     "flipper_length_mm" "body_mass_g"      
## [7] "sex"               "year"

  penguins %>%
    select(species, island, bill_length_mm, body_mass_g, year) %>%
    gt() %>%
    tab_header(title = md("The penguins dataset"))
The penguins dataset
species island bill_length_mm body_mass_g year
Adelie Torgersen 39.1 3750 2007
Adelie Torgersen 39.5 3800 2007
Adelie Torgersen 40.3 3250 2007
Adelie Torgersen NA NA 2007
Adelie Torgersen 36.7 3450 2007
Adelie Torgersen 39.3 3650 2007
Adelie Torgersen 38.9 3625 2007
Adelie Torgersen 39.2 4675 2007
Adelie Torgersen 34.1 3475 2007
Adelie Torgersen 42.0 4250 2007
Adelie Torgersen 37.8 3300 2007
Adelie Torgersen 37.8 3700 2007
Adelie Torgersen 41.1 3200 2007
Adelie Torgersen 38.6 3800 2007
Adelie Torgersen 34.6 4400 2007
Adelie Torgersen 36.6 3700 2007
Adelie Torgersen 38.7 3450 2007
Adelie Torgersen 42.5 4500 2007
Adelie Torgersen 34.4 3325 2007
Adelie Torgersen 46.0 4200 2007
Adelie Biscoe 37.8 3400 2007
Adelie Biscoe 37.7 3600 2007
Adelie Biscoe 35.9 3800 2007
Adelie Biscoe 38.2 3950 2007
Adelie Biscoe 38.8 3800 2007
Adelie Biscoe 35.3 3800 2007
Adelie Biscoe 40.6 3550 2007
Adelie Biscoe 40.5 3200 2007
Adelie Biscoe 37.9 3150 2007
Adelie Biscoe 40.5 3950 2007
Adelie Dream 39.5 3250 2007
Adelie Dream 37.2 3900 2007
Adelie Dream 39.5 3300 2007
Adelie Dream 40.9 3900 2007
Adelie Dream 36.4 3325 2007
Adelie Dream 39.2 4150 2007
Adelie Dream 38.8 3950 2007
Adelie Dream 42.2 3550 2007
Adelie Dream 37.6 3300 2007
Adelie Dream 39.8 4650 2007
Adelie Dream 36.5 3150 2007
Adelie Dream 40.8 3900 2007
Adelie Dream 36.0 3100 2007
Adelie Dream 44.1 4400 2007
Adelie Dream 37.0 3000 2007
Adelie Dream 39.6 4600 2007
Adelie Dream 41.1 3425 2007
Adelie Dream 37.5 2975 2007
Adelie Dream 36.0 3450 2007
Adelie Dream 42.3 4150 2007
Adelie Biscoe 39.6 3500 2008
Adelie Biscoe 40.1 4300 2008
Adelie Biscoe 35.0 3450 2008
Adelie Biscoe 42.0 4050 2008
Adelie Biscoe 34.5 2900 2008
Adelie Biscoe 41.4 3700 2008
Adelie Biscoe 39.0 3550 2008
Adelie Biscoe 40.6 3800 2008
Adelie Biscoe 36.5 2850 2008
Adelie Biscoe 37.6 3750 2008
Adelie Biscoe 35.7 3150 2008
Adelie Biscoe 41.3 4400 2008
Adelie Biscoe 37.6 3600 2008
Adelie Biscoe 41.1 4050 2008
Adelie Biscoe 36.4 2850 2008
Adelie Biscoe 41.6 3950 2008
Adelie Biscoe 35.5 3350 2008
Adelie Biscoe 41.1 4100 2008
Adelie Torgersen 35.9 3050 2008
Adelie Torgersen 41.8 4450 2008
Adelie Torgersen 33.5 3600 2008
Adelie Torgersen 39.7 3900 2008
Adelie Torgersen 39.6 3550 2008
Adelie Torgersen 45.8 4150 2008
Adelie Torgersen 35.5 3700 2008
Adelie Torgersen 42.8 4250 2008
Adelie Torgersen 40.9 3700 2008
Adelie Torgersen 37.2 3900 2008
Adelie Torgersen 36.2 3550 2008
Adelie Torgersen 42.1 4000 2008
Adelie Torgersen 34.6 3200 2008
Adelie Torgersen 42.9 4700 2008
Adelie Torgersen 36.7 3800 2008
Adelie Torgersen 35.1 4200 2008
Adelie Dream 37.3 3350 2008
Adelie Dream 41.3 3550 2008
Adelie Dream 36.3 3800 2008
Adelie Dream 36.9 3500 2008
Adelie Dream 38.3 3950 2008
Adelie Dream 38.9 3600 2008
Adelie Dream 35.7 3550 2008
Adelie Dream 41.1 4300 2008
Adelie Dream 34.0 3400 2008
Adelie Dream 39.6 4450 2008
Adelie Dream 36.2 3300 2008
Adelie Dream 40.8 4300 2008
Adelie Dream 38.1 3700 2008
Adelie Dream 40.3 4350 2008
Adelie Dream 33.1 2900 2008
Adelie Dream 43.2 4100 2008
Adelie Biscoe 35.0 3725 2009
Adelie Biscoe 41.0 4725 2009
Adelie Biscoe 37.7 3075 2009
Adelie Biscoe 37.8 4250 2009
Adelie Biscoe 37.9 2925 2009
Adelie Biscoe 39.7 3550 2009
Adelie Biscoe 38.6 3750 2009
Adelie Biscoe 38.2 3900 2009
Adelie Biscoe 38.1 3175 2009
Adelie Biscoe 43.2 4775 2009
Adelie Biscoe 38.1 3825 2009
Adelie Biscoe 45.6 4600 2009
Adelie Biscoe 39.7 3200 2009
Adelie Biscoe 42.2 4275 2009
Adelie Biscoe 39.6 3900 2009
Adelie Biscoe 42.7 4075 2009
Adelie Torgersen 38.6 2900 2009
Adelie Torgersen 37.3 3775 2009
Adelie Torgersen 35.7 3350 2009
Adelie Torgersen 41.1 3325 2009
Adelie Torgersen 36.2 3150 2009
Adelie Torgersen 37.7 3500 2009
Adelie Torgersen 40.2 3450 2009
Adelie Torgersen 41.4 3875 2009
Adelie Torgersen 35.2 3050 2009
Adelie Torgersen 40.6 4000 2009
Adelie Torgersen 38.8 3275 2009
Adelie Torgersen 41.5 4300 2009
Adelie Torgersen 39.0 3050 2009
Adelie Torgersen 44.1 4000 2009
Adelie Torgersen 38.5 3325 2009
Adelie Torgersen 43.1 3500 2009
Adelie Dream 36.8 3500 2009
Adelie Dream 37.5 4475 2009
Adelie Dream 38.1 3425 2009
Adelie Dream 41.1 3900 2009
Adelie Dream 35.6 3175 2009
Adelie Dream 40.2 3975 2009
Adelie Dream 37.0 3400 2009
Adelie Dream 39.7 4250 2009
Adelie Dream 40.2 3400 2009
Adelie Dream 40.6 3475 2009
Adelie Dream 32.1 3050 2009
Adelie Dream 40.7 3725 2009
Adelie Dream 37.3 3000 2009
Adelie Dream 39.0 3650 2009
Adelie Dream 39.2 4250 2009
Adelie Dream 36.6 3475 2009
Adelie Dream 36.0 3450 2009
Adelie Dream 37.8 3750 2009
Adelie Dream 36.0 3700 2009
Adelie Dream 41.5 4000 2009
Gentoo Biscoe 46.1 4500 2007
Gentoo Biscoe 50.0 5700 2007
Gentoo Biscoe 48.7 4450 2007
Gentoo Biscoe 50.0 5700 2007
Gentoo Biscoe 47.6 5400 2007
Gentoo Biscoe 46.5 4550 2007
Gentoo Biscoe 45.4 4800 2007
Gentoo Biscoe 46.7 5200 2007
Gentoo Biscoe 43.3 4400 2007
Gentoo Biscoe 46.8 5150 2007
Gentoo Biscoe 40.9 4650 2007
Gentoo Biscoe 49.0 5550 2007
Gentoo Biscoe 45.5 4650 2007
Gentoo Biscoe 48.4 5850 2007
Gentoo Biscoe 45.8 4200 2007
Gentoo Biscoe 49.3 5850 2007
Gentoo Biscoe 42.0 4150 2007
Gentoo Biscoe 49.2 6300 2007
Gentoo Biscoe 46.2 4800 2007
Gentoo Biscoe 48.7 5350 2007
Gentoo Biscoe 50.2 5700 2007
Gentoo Biscoe 45.1 5000 2007
Gentoo Biscoe 46.5 4400 2007
Gentoo Biscoe 46.3 5050 2007
Gentoo Biscoe 42.9 5000 2007
Gentoo Biscoe 46.1 5100 2007
Gentoo Biscoe 44.5 4100 2007
Gentoo Biscoe 47.8 5650 2007
Gentoo Biscoe 48.2 4600 2007
Gentoo Biscoe 50.0 5550 2007
Gentoo Biscoe 47.3 5250 2007
Gentoo Biscoe 42.8 4700 2007
Gentoo Biscoe 45.1 5050 2007
Gentoo Biscoe 59.6 6050 2007
Gentoo Biscoe 49.1 5150 2008
Gentoo Biscoe 48.4 5400 2008
Gentoo Biscoe 42.6 4950 2008
Gentoo Biscoe 44.4 5250 2008
Gentoo Biscoe 44.0 4350 2008
Gentoo Biscoe 48.7 5350 2008
Gentoo Biscoe 42.7 3950 2008
Gentoo Biscoe 49.6 5700 2008
Gentoo Biscoe 45.3 4300 2008
Gentoo Biscoe 49.6 4750 2008
Gentoo Biscoe 50.5 5550 2008
Gentoo Biscoe 43.6 4900 2008
Gentoo Biscoe 45.5 4200 2008
Gentoo Biscoe 50.5 5400 2008
Gentoo Biscoe 44.9 5100 2008
Gentoo Biscoe 45.2 5300 2008
Gentoo Biscoe 46.6 4850 2008
Gentoo Biscoe 48.5 5300 2008
Gentoo Biscoe 45.1 4400 2008
Gentoo Biscoe 50.1 5000 2008
Gentoo Biscoe 46.5 4900 2008
Gentoo Biscoe 45.0 5050 2008
Gentoo Biscoe 43.8 4300 2008
Gentoo Biscoe 45.5 5000 2008
Gentoo Biscoe 43.2 4450 2008
Gentoo Biscoe 50.4 5550 2008
Gentoo Biscoe 45.3 4200 2008
Gentoo Biscoe 46.2 5300 2008
Gentoo Biscoe 45.7 4400 2008
Gentoo Biscoe 54.3 5650 2008
Gentoo Biscoe 45.8 4700 2008
Gentoo Biscoe 49.8 5700 2008
Gentoo Biscoe 46.2 4650 2008
Gentoo Biscoe 49.5 5800 2008
Gentoo Biscoe 43.5 4700 2008
Gentoo Biscoe 50.7 5550 2008
Gentoo Biscoe 47.7 4750 2008
Gentoo Biscoe 46.4 5000 2008
Gentoo Biscoe 48.2 5100 2008
Gentoo Biscoe 46.5 5200 2008
Gentoo Biscoe 46.4 4700 2008
Gentoo Biscoe 48.6 5800 2008
Gentoo Biscoe 47.5 4600 2008
Gentoo Biscoe 51.1 6000 2008
Gentoo Biscoe 45.2 4750 2008
Gentoo Biscoe 45.2 5950 2008
Gentoo Biscoe 49.1 4625 2009
Gentoo Biscoe 52.5 5450 2009
Gentoo Biscoe 47.4 4725 2009
Gentoo Biscoe 50.0 5350 2009
Gentoo Biscoe 44.9 4750 2009
Gentoo Biscoe 50.8 5600 2009
Gentoo Biscoe 43.4 4600 2009
Gentoo Biscoe 51.3 5300 2009
Gentoo Biscoe 47.5 4875 2009
Gentoo Biscoe 52.1 5550 2009
Gentoo Biscoe 47.5 4950 2009
Gentoo Biscoe 52.2 5400 2009
Gentoo Biscoe 45.5 4750 2009
Gentoo Biscoe 49.5 5650 2009
Gentoo Biscoe 44.5 4850 2009
Gentoo Biscoe 50.8 5200 2009
Gentoo Biscoe 49.4 4925 2009
Gentoo Biscoe 46.9 4875 2009
Gentoo Biscoe 48.4 4625 2009
Gentoo Biscoe 51.1 5250 2009
Gentoo Biscoe 48.5 4850 2009
Gentoo Biscoe 55.9 5600 2009
Gentoo Biscoe 47.2 4975 2009
Gentoo Biscoe 49.1 5500 2009
Gentoo Biscoe 47.3 4725 2009
Gentoo Biscoe 46.8 5500 2009
Gentoo Biscoe 41.7 4700 2009
Gentoo Biscoe 53.4 5500 2009
Gentoo Biscoe 43.3 4575 2009
Gentoo Biscoe 48.1 5500 2009
Gentoo Biscoe 50.5 5000 2009
Gentoo Biscoe 49.8 5950 2009
Gentoo Biscoe 43.5 4650 2009
Gentoo Biscoe 51.5 5500 2009
Gentoo Biscoe 46.2 4375 2009
Gentoo Biscoe 55.1 5850 2009
Gentoo Biscoe 44.5 4875 2009
Gentoo Biscoe 48.8 6000 2009
Gentoo Biscoe 47.2 4925 2009
Gentoo Biscoe NA NA 2009
Gentoo Biscoe 46.8 4850 2009
Gentoo Biscoe 50.4 5750 2009
Gentoo Biscoe 45.2 5200 2009
Gentoo Biscoe 49.9 5400 2009
Chinstrap Dream 46.5 3500 2007
Chinstrap Dream 50.0 3900 2007
Chinstrap Dream 51.3 3650 2007
Chinstrap Dream 45.4 3525 2007
Chinstrap Dream 52.7 3725 2007
Chinstrap Dream 45.2 3950 2007
Chinstrap Dream 46.1 3250 2007
Chinstrap Dream 51.3 3750 2007
Chinstrap Dream 46.0 4150 2007
Chinstrap Dream 51.3 3700 2007
Chinstrap Dream 46.6 3800 2007
Chinstrap Dream 51.7 3775 2007
Chinstrap Dream 47.0 3700 2007
Chinstrap Dream 52.0 4050 2007
Chinstrap Dream 45.9 3575 2007
Chinstrap Dream 50.5 4050 2007
Chinstrap Dream 50.3 3300 2007
Chinstrap Dream 58.0 3700 2007
Chinstrap Dream 46.4 3450 2007
Chinstrap Dream 49.2 4400 2007
Chinstrap Dream 42.4 3600 2007
Chinstrap Dream 48.5 3400 2007
Chinstrap Dream 43.2 2900 2007
Chinstrap Dream 50.6 3800 2007
Chinstrap Dream 46.7 3300 2007
Chinstrap Dream 52.0 4150 2007
Chinstrap Dream 50.5 3400 2008
Chinstrap Dream 49.5 3800 2008
Chinstrap Dream 46.4 3700 2008
Chinstrap Dream 52.8 4550 2008
Chinstrap Dream 40.9 3200 2008
Chinstrap Dream 54.2 4300 2008
Chinstrap Dream 42.5 3350 2008
Chinstrap Dream 51.0 4100 2008
Chinstrap Dream 49.7 3600 2008
Chinstrap Dream 47.5 3900 2008
Chinstrap Dream 47.6 3850 2008
Chinstrap Dream 52.0 4800 2008
Chinstrap Dream 46.9 2700 2008
Chinstrap Dream 53.5 4500 2008
Chinstrap Dream 49.0 3950 2008
Chinstrap Dream 46.2 3650 2008
Chinstrap Dream 50.9 3550 2008
Chinstrap Dream 45.5 3500 2008
Chinstrap Dream 50.9 3675 2009
Chinstrap Dream 50.8 4450 2009
Chinstrap Dream 50.1 3400 2009
Chinstrap Dream 49.0 4300 2009
Chinstrap Dream 51.5 3250 2009
Chinstrap Dream 49.8 3675 2009
Chinstrap Dream 48.1 3325 2009
Chinstrap Dream 51.4 3950 2009
Chinstrap Dream 45.7 3600 2009
Chinstrap Dream 50.7 4050 2009
Chinstrap Dream 42.5 3350 2009
Chinstrap Dream 52.2 3450 2009
Chinstrap Dream 45.2 3250 2009
Chinstrap Dream 49.3 4050 2009
Chinstrap Dream 50.2 3800 2009
Chinstrap Dream 45.6 3525 2009
Chinstrap Dream 51.9 3950 2009
Chinstrap Dream 46.8 3650 2009
Chinstrap Dream 45.7 3650 2009
Chinstrap Dream 55.8 4000 2009
Chinstrap Dream 43.5 3400 2009
Chinstrap Dream 49.6 3775 2009
Chinstrap Dream 50.8 4100 2009
Chinstrap Dream 50.2 3775 2009
Complext table designed in gt() 
  library(tidyverse)

## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
## ✔ forcats   1.0.0     ✔ readr     2.1.5
## ✔ ggplot2   3.5.1     ✔ stringr   1.5.1
## ✔ lubridate 1.9.3     ✔ tibble    3.2.1
## ✔ purrr     1.0.2     ✔ tidyr     1.3.1
## ── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
## ✖ dplyr::filter() masks stats::filter()
## ✖ dplyr::lag()    masks stats::lag()
## ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors

  library(gt)
  library(palmerpenguins)

  penguins %>%
    group_by (species) %>%
    summarize_at(
      .vars = c(
        "bill_length_mm",
        "bill_depth_mm",
        "flipper_length_mm",
        "body_mass_g"
        ),
      .funs = ~ mean(., na.rm = TRUE)
      ) %>%
    gt(rowname_col = "species") %>%
    tab_header(
              title = md("Summary of penguins dataset"),
              subtitle = md("Uses of the data")
              ) %>%
    cols_label(
              bill_length_mm = md("Bill Length,<br>mm"),
              bill_depth_mm = md("Bill depth,<br>mm"),
              flipper_length_mm = md("Flipper length,<br>mm"),
              body_mass_g = md("Body Mass,<br>kg")
              ) %>%
    opt_align_table_header(align = "left") %>%
    fmt_number(columns = everything()) %>%
    fmt_number(columns = body_mass_g, scale_by = 1/1000) %>%
    cols_width(bill_length_mm ~ px(100),
              bill_depth_mm ~ px(100),
              flipper_length_mm ~ px(100),
              body_mass_g ~ px(100))
Summary of penguins dataset
Uses of the data
Bill Length,
mm		 Bill depth,
mm		 Flipper length,
mm		 Body Mass,
kg
Adelie 38.79 18.35 189.95 3.70
Chinstrap 48.83 18.42 195.82 3.73
Gentoo 47.50 14.98 217.19 5.08