72 x 3 = 216 &lt;br&gt;
`out.width` = `fig.width` * `dpi` / `fig.retina`
]

---
class: inverse
name: gg-theme

.pull-left[
# ü§≠

````
```{r dev = 'svg', dev.args = list(bg = "transparent")}
invthm &lt;- theme_minimal() + 
  theme(
    panel.background = element_rect(fill = "transparent", colour = NA), 
    plot.background = element_rect(fill = "transparent", colour = NA),
    legend.background = element_rect(fill = "transparent", colour = NA),
    legend.key = element_rect(fill = "transparent", colo