diff --git a/R/utils.R b/R/utils.R
index 5e66f5c..37008e7 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -43,8 +43,8 @@ cmyk2rgb <- function(C, M, Y, K) {
 #'
 print.palette <- function(x, ...) {
   n <- length(x)
-  # old <- par(mar = c(0.5, 0.5, 0.5, 0.5))
-  # on.exit(par(old))
+  old <- par(mar = c(0.5, 0.5, 0.5, 0.5))
+  on.exit(par(old))
 
   image(1:n, 1, as.matrix(1:n), col = x,
         ylab = "", xaxt = "n", yaxt = "n", bty = "n")
diff --git a/README.Rmd b/README.Rmd
index 6d811ac..c2b472a 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -61,7 +61,7 @@ oxford_colours |>
   knitr::kable()
 ```
 
-```{r oxford-colours-graphic, echo = FALSE, fig.height = 1}
+```{r oxford-colours-graphic, echo = FALSE, fig.height = 1, fig.align = "center"}
 structure(get_oxford_colours() |> (\(x) x[x != ""])(), class = "palette", name = "Oxford Colours")
 ```
 
@@ -87,7 +87,7 @@ Based on the [University of Oxford](https://ox.ac.uk)'s [visual identity guideli
 oxford_theme_palettes()$heritage
 ```
 
-```{r oxford-palettes-heritage-show, echo = FALSE, fig.height = 1}
+```{r oxford-palettes-heritage-show, echo = FALSE, fig.height = 1, fig.align = "center"}
 structure(oxford_theme_palettes()$heritage, class = "palette", name = "heritage")
 ```
 
@@ -97,7 +97,7 @@ structure(oxford_theme_palettes()$heritage, class = "palette", name = "heritage"
 oxford_theme_palettes()$contemporary
 ```
 
-```{r oxford-palettes-contemporary-show, echo = FALSE, fig.height = 1}
+```{r oxford-palettes-contemporary-show, echo = FALSE, fig.height = 1, fig.align = "center"}
 structure(oxford_theme_palettes()$contemporary, class = "palette", name = "contemporary")
 ```
 
@@ -107,7 +107,7 @@ structure(oxford_theme_palettes()$contemporary, class = "palette", name = "conte
 oxford_theme_palettes()$celebratory
 ```
 
-```{r oxford-palettes-celebratory-show, echo = FALSE, fig.height = 1}
+```{r oxford-palettes-celebratory-show, echo = FALSE, fig.height = 1, fig.align = "center"}
 structure(oxford_theme_palettes()$celebratory, class = "palette", name = "celebratory")
 ```
 
@@ -117,7 +117,7 @@ structure(oxford_theme_palettes()$celebratory, class = "palette", name = "celebr
 oxford_theme_palettes()$corporate
 ```
 
-```{r oxford-palettes-corporate-show, echo = FALSE, fig.height = 1}
+```{r oxford-palettes-corporate-show, echo = FALSE, fig.height = 1, fig.align = "center"}
 structure(oxford_theme_palettes()$corporate, class = "palette", name = "corporate")
 ```
 
diff --git a/README.md b/README.md
index 797ab5b..4d69a1a 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,7 @@ the following colours are available from this package:
 | Gold                 |               |                 |          | 10122C        |
 | Silver               |               |                 |          | 10103C        |
 
-![](man/figures/README-oxford-colours-graphic-1.png)<!-- -->
+<img src="man/figures/README-oxford-colours-graphic-1.png" style="display: block; margin: auto;" />
 
 You can access either the name, RGB, CMYK, hex code, and/or Pantone
 values of each Oxford colour through the `get_oxford_colours()` function
@@ -136,7 +136,7 @@ oxford_theme_palettes()$heritage
 #> [1] "#994636" "#E08D79" "#C4A29E" "#A0AF84" "#426A5A"
 ```
 
-![](man/figures/README-oxford-palettes-heritage-show-1.png)<!-- -->
+<img src="man/figures/README-oxford-palettes-heritage-show-1.png" style="display: block; margin: auto;" />
 
 #### Contemporary
 
@@ -145,7 +145,7 @@ oxford_theme_palettes()$contemporary
 #> [1] "#FE615A" "#ED9390" "#E4F0EF" "#789E9E" "#00AAB4"
 ```
 
-![](man/figures/README-oxford-palettes-contemporary-show-1.png)<!-- -->
+<img src="man/figures/README-oxford-palettes-contemporary-show-1.png" style="display: block; margin: auto;" />
 
 #### Celebratory
 
@@ -154,7 +154,7 @@ oxford_theme_palettes()$celebratory
 #> [1] "#15616D" "#776885" "#E2C044" "#D4CDF4" "#7F055F"
 ```
 
-![](man/figures/README-oxford-palettes-celebratory-show-1.png)<!-- -->
+<img src="man/figures/README-oxford-palettes-celebratory-show-1.png" style="display: block; margin: auto;" />
 
 #### Corporate
 
@@ -163,7 +163,7 @@ oxford_theme_palettes()$corporate
 #> [1] "#FB5607" "#B9D6F2" "#95C11F" "#49B6FF" "#1D42A6"
 ```
 
-![](man/figures/README-oxford-palettes-corporate-show-1.png)<!-- -->
+<img src="man/figures/README-oxford-palettes-corporate-show-1.png" style="display: block; margin: auto;" />
 
 ### Oxford theme paletttes for use in plotting