diff --git a/R/theme.R b/R/theme.R
index 2ae9a7b..16d1851 100644
--- a/R/theme.R
+++ b/R/theme.R
@@ -7,15 +7,15 @@
 #' parameters will be passed to corresponding elements of the forest plot.
 #'
 #' \itemize{
-#'   \item{\code{ci_*}}{Control the graphical parameters of confidence intervals}
-#'   \item{\code{legend_*}}{Control the graphical parameters of legend}
-#'   \item{\code{xaxis_*}}{Control the graphical parameters of x-axis}
-#'   \item{\code{refline_*}}{Control the graphical parameters of reference line}
-#'   \item{\code{vertline_*}}{Control the graphical parameters of vertical line}
-#'   \item{\code{summary_*}}{Control the graphical parameters of diamond shaped summary CI}
-#'   \item{\code{footnote_*}}{Control the graphical parameters of footnote}
-#'   \item{\code{title_*}}{Control the graphical parameters of title}
-#'   \item{\code{arrow_*}}{Control the graphical parameters of arrow}
+#'   \item \code{ci_*} Control the graphical parameters of confidence intervals
+#'   \item \code{legend_*} Control the graphical parameters of legend
+#'   \item \code{xaxis_*} Control the graphical parameters of x-axis
+#'   \item \code{refline_*} Control the graphical parameters of reference line
+#'   \item \code{vertline_*} Control the graphical parameters of vertical line
+#'   \item \code{summary_*} Control the graphical parameters of diamond shaped summary CI
+#'   \item \code{footnote_*} Control the graphical parameters of footnote
+#'   \item \code{title_*} Control the graphical parameters of title
+#'   \item \code{arrow_*} Control the graphical parameters of arrow
 #' }
 #'
 #' See \code{\link[grid]{gpar}} for more details.
diff --git a/inst/examples/forestplot-example.r b/inst/examples/forestplot-example.r
index c4e8dbb..5070a9f 100644
--- a/inst/examples/forestplot-example.r
+++ b/inst/examples/forestplot-example.r
@@ -1,3 +1,4 @@
+library(grid)
 # Read provided sample example data
 dt <- read.csv(system.file("extdata", "example_data.csv", package = "forestploter"))
 
@@ -25,9 +26,8 @@ dt$`HR (95% CI)` <- ifelse(is.na(dt$se), "",
 
 # Define theme
 tm <- forest_theme(base_size = 10,
-                   refline_col = "red",
-                   footnote_col = "#636363",
-                   footnote_fontface = "italic")
+                   refline_gp = gpar(col = "red"),
+                   footnote_gp = gpar(col = "#636363", fontface = "italic"))
 
 p <- forest(dt[,c(1:3, 8:9)],
             est = dt$est,
diff --git a/man/forest.Rd b/man/forest.Rd
index 6fc10e4..6348afb 100644
--- a/man/forest.Rd
+++ b/man/forest.Rd
@@ -136,6 +136,7 @@ A data frame will be used for the basic layout of the forest plot.
 Graphical parameters can be set using the \code{\link{forest_theme}} function.
 }
 \examples{
+library(grid)
 # Read provided sample example data
 dt <- read.csv(system.file("extdata", "example_data.csv", package = "forestploter"))
 
@@ -163,9 +164,8 @@ dt$`HR (95\% CI)` <- ifelse(is.na(dt$se), "",
 
 # Define theme
 tm <- forest_theme(base_size = 10,
-                   refline_col = "red",
-                   footnote_col = "#636363",
-                   footnote_fontface = "italic")
+                   refline_gp = gpar(col = "red"),
+                   footnote_gp = gpar(col = "#636363", fontface = "italic"))
 
 p <- forest(dt[,c(1:3, 8:9)],
             est = dt$est,
diff --git a/man/forest_theme.Rd b/man/forest_theme.Rd
index a227e4f..1a57593 100644
--- a/man/forest_theme.Rd
+++ b/man/forest_theme.Rd
@@ -130,15 +130,15 @@ Default theme for the forest plot, but can pass other parameters. The
 parameters will be passed to corresponding elements of the forest plot.
 
 \itemize{
-\item{\code{ci_*}}{Control the graphical parameters of confidence intervals}
-\item{\code{legend_*}}{Control the graphical parameters of legend}
-\item{\code{xaxis_*}}{Control the graphical parameters of x-axis}
-\item{\code{refline_*}}{Control the graphical parameters of reference line}
-\item{\code{vertline_*}}{Control the graphical parameters of vertical line}
-\item{\code{summary_*}}{Control the graphical parameters of diamond shaped summary CI}
-\item{\code{footnote_*}}{Control the graphical parameters of footnote}
-\item{\code{title_*}}{Control the graphical parameters of title}
-\item{\code{arrow_*}}{Control the graphical parameters of arrow}
+\item \code{ci_*} Control the graphical parameters of confidence intervals
+\item \code{legend_*} Control the graphical parameters of legend
+\item \code{xaxis_*} Control the graphical parameters of x-axis
+\item \code{refline_*} Control the graphical parameters of reference line
+\item \code{vertline_*} Control the graphical parameters of vertical line
+\item \code{summary_*} Control the graphical parameters of diamond shaped summary CI
+\item \code{footnote_*} Control the graphical parameters of footnote
+\item \code{title_*} Control the graphical parameters of title
+\item \code{arrow_*} Control the graphical parameters of arrow
 }
 
 See \code{\link[grid]{gpar}} for more details.
diff --git a/vignettes/forestploter-intro.Rmd b/vignettes/forestploter-intro.Rmd
index bc4de7c..ca984a4 100644
--- a/vignettes/forestploter-intro.Rmd
+++ b/vignettes/forestploter-intro.Rmd
@@ -113,9 +113,7 @@ tm <- forest_theme(base_size = 10,
                    ci_lwd = 1.5,
                    ci_Theight = 0.2, # Set a T end at the end of CI 
                    # Reference line width/type/color
-                   refline_lwd = 1,
-                   refline_lty = "dashed",
-                   refline_col = "grey20",
+                   refline_lwd = gpar(lwd = 1, lty = "dashed", col = "grey20"),
                    # Vertical line width/type/color
                    vertline_lwd = 1,
                    vertline_lty = "dashed",