The cell_fill() helper function is to be used with the tab_style()
function, which itself allows for the setting of custom styles to one or more
cells. Specifically, the call to cell_fill() should be bound to the
styles argument of tab_style().
cell_fill(color = "#D3D3D3", alpha = NULL)A list object of class cell_styles.
The fill color. If nothing is provided, then "#D3D3D3" (light
gray) will be used as a default.
An optional alpha transparency value for the color as single
value in the range of 0 (fully transparent) to 1 (fully opaque). If not
provided the fill color will either be fully opaque or use alpha
information from the color value if it is supplied in the #RRGGBBAA format.
Use exibble to create a gt table. Add styles with tab_style() and
the cell_fill() helper function.
exibble %>%
dplyr::select(num, currency) %>%
gt() %>%
fmt_number(
columns = c(num, currency),
decimals = 1
) %>%
tab_style(
style = cell_fill(color = "lightblue"),
locations = cells_body(
columns = num,
rows = num >= 5000
)
) %>%
tab_style(
style = cell_fill(color = "gray85"),
locations = cells_body(
columns = currency,
rows = currency < 100
)
)

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Other helper functions:
adjust_luminance(),
cell_borders(),
cell_text(),
cells_body(),
cells_column_labels(),
cells_column_spanners(),
cells_footnotes(),
cells_grand_summary(),
cells_row_groups(),
cells_source_notes(),
cells_stub_grand_summary(),
cells_stub_summary(),
cells_stubhead(),
cells_stub(),
cells_summary(),
cells_title(),
currency(),
default_fonts(),
escape_latex(),
google_font(),
gt_latex_dependencies(),
html(),
md(),
pct(),
px(),
random_id()