ggTHP:

theme_brookings <- function(base_size = 14,
                            base_family = "Roboto",
                            base_line_size = base_size / 24,
                            base_rect_size = base_size / 24,
                            web = FALSE,
                            ticks = TRUE) {
  # The half-line (base-fontsize / 2) sets up the basic vertical
  # rhythm of the theme. Most margins will be set to this value.
  # However, when we work with relative sizes, we may want to multiply
  # `half_line` with the appropriate relative size. This applies in
  # particular for axis tick sizes. And also, for axis ticks and
  # axis titles, `half_size` is too large a distance, and we use `half_size/2`
  # instead.
  
  half_line <- base_size / 2
  
  # Throughout the theme, we use three font sizes, `base_size` (`rel(1)`)
  # for normal, `rel(0.8)` for small, and `rel(1.2)` for large.
  
  
  
  t <- theme_light() %+replace% theme(
    # Elements in this first block aren't used directly, but are inherited
    # by others
    line =
      element_line(
        colour = "black",
        size = base_line_size,
        linetype = 1,
        lineend = "butt"
      ),
    rect =
      element_rect(
        fill = NULL,
        colour = "black",
        size = base_rect_size,
        linetype = 1
      ),
    text =
      element_text(
        family = base_family,
        face = "plain",
        colour = "black",
        size = base_size,
        lineheight = 1,
        hjust = 0.5,
        vjust = 0.5,
        angle = 0,
        margin = margin(),
        debug = FALSE
      ),
    axis.line = ggplot2::element_line(),
    axis.line.x = ggplot2::element_line(colour = "#000000",
                                        size = NULL,
                                        linetype = NULL,
                                        lineend = NULL),
    axis.line.y = ggplot2::element_blank(),
    
    
    # axis.text =          element_text(size = rel(0.8), colour = "#000000"),
    # axis.text.x =        element_text(margin = margin(t = 0.8 * half_line / 2), vjust = 1),
    # axis.text.x.top =    element_text(margin = margin(b = 0.8 * half_line / 2), vjust = 0),
    # axis.text.y =        element_text(margin = margin(r = 0.8 * half_line / 2), hjust = 1),
    # axis.text.y.right =  element_text(margin = margin(l = 0.8 * half_line / 2), hjust = 0),
    # 
    # axis.title.x =       element_text(margin = margin(t = 1.25 * half_line),
    #                                   size = rel(0.7),
    #                                   vjust = 1, face = 'bold'),
    
    # axis.title.x.top =   element_text(margin = margin(b = half_line / 2),
    #                                   vjust = 0),
    
    # axis.title.y =       element_text(
    #   angle = 90,
    #   margin = margin(r = half_line * 1.25),
    #   vjust = 1,
    #   face = 'bold',
    #   size = rel(0.7)
    # ),
    # axis.title.y.right = element_text(
    #   angle = -90,
    #   margin = margin(l = half_line / 2),
    #   vjust = 0
    # ),
    
    legend.background =  element_rect(colour = NA),
    # legend.spacing =     unit( half_line, "pt"),
    # legend.spacing.x =    NULL,
    # legend.spacing.y =    NULL,
    # legend.margin =      margin(0,0,0,0),
    #legend.key =         element_blank(),
    #legend.key.size =    unit(rel(0.8), "lines"),
    #legend.key.height =  NULL,
    #legend.key.width =   NULL,
    #legend.text =        element_text(size = rel(1)),
    #legend.text.align =  0,
    #legend.title =       element_blank(),
    #legend.title.align = NULL,
    #legend.position =    "top",
    #legend.direction =   NULL,
    #legend.justification = "center",
    # legend.box =         NULL,
    # legend.box.margin =  margin(0, 0, 0, 0, "cm"),
    # legend.box.background = element_blank(),
    # legend.box.spacing = unit(2 * half_line, "pt"),
    
    panel.background =   element_blank(),
    panel.border =       element_blank(),
    panel.grid =         element_line(colour = "#CCCCCC",
                                      # size = 1,
                                      linetype = "solid"),            ### Horizontal Gridlines - Solid ###
    panel.grid.major.x = element_blank(),
    panel.grid.minor =   element_blank(),
    # panel.spacing =      unit(half_line, "pt"),
    # panel.spacing.x =  unit(1.5, "lines"),
    # panel.spacing.y =  unit(2, "lines"),
    panel.ontop    =     FALSE,
    
    strip.background =   element_rect(fill = "#007363", colour = NA),      ### FIGURE NUMBER LABEL COLOR - THP ###
    strip.text =         element_text(
      colour = "#FAFAFA",
      size = rel(0.8),
      #margin = margin(0.8 * half_line, 0.8 * half_line, 0.8 * half_line, 0.8 * half_line),
      face = 'bold'
      
    ),
    # strip.text.x =       NULL,
    # strip.text.y =       element_text(angle = -90),
    # strip.text.y.left =  element_text(angle = 90),
    # # strip.placement =    "outside",
    # strip.placement.x =  NULL,
    # strip.placement.y =  NULL,
    # strip.switch.pad.grid = unit(half_line / 2, "pt"),
    # strip.switch.pad.wrap = unit(half_line / 2, "pt"),
    
    plot.title =         ggtext::element_textbox_simple(
      # font size "large"
      size = rel(1.2),
      color = "#007363",                                     ### TITLE COLOR - THP ###
      face = "bold",
      hjust = 0,
      vjust = 1
      #,
      #margin = margin(b = 1.5*base_size, t = base_size/2)      ### CHANGED 'B'-BOTTOM MARGIN TO BASE_SIZE/2 FROM HALF_LINE/2
    ),
    plot.title.position = "plot",
    plot.subtitle =      ggtext::element_textbox_simple(
      # font size "regular"
      hjust = 0,
      size = rel(1),
      vjust = 1
      #,
      #margin = margin(b = base_size)
    ),
    plot.caption =       ggtext::element_textbox_simple(
      # font size "small"
      size = rel(0.8),
      vjust = 1,
      color = "#666666",
      # margin = margin(t = half_line),
      hjust = 0),
      
#    ),
    plot.caption.position = "plot",
    plot.tag =           element_text(
      size = rel(0.8),
      hjust = 0,
      vjust = 1,
      color = "#007363"                             ### FIGURE NUMBER LABEL COLOR - THP ###
      #  ),
      # plot.tag.position =  c(0, 1),
      # plot.margin = unit(c(half_line, half_line, half_line * 2, half_line), "pt"),
      # plot.margin =        margin(half_line, half_line, half_line * 2, half_line),
      # plot.margin = unit(c(0.5, 0.5, 2.5, 0.5), "lines"),
      
      # complete = FALSE
    ))
  
  
  # if (ticks == FALSE) {
  #   t <- t + theme(
  #     axis.ticks = element_blank(),
  #     axis.ticks.x = element_blank(),
  #     axis.ticks.y = element_blank()
  #   )
  # } else {
  #   t <-
  #     t + theme(
  #       axis.ticks =         element_line(colour = "#000000"),
  #       axis.ticks.length =  unit(half_line / 2, "pt"),
  #       axis.ticks.length.x = NULL,
  #       axis.ticks.length.x.top = NULL,
  #       axis.ticks.length.x.bottom = NULL,
  #       axis.ticks.y = element_blank()
  #       
  #     )
  # }
  # 
  # if(web == FALSE){
  #   t <-
  #     t + theme(plot.background = element_blank())
  # }
  # 
  # else{
  #   t <-
  #     t + theme(plot.background = element_rect(fill = '#FAFAFA'))
  # }
}