Adjust size of leaflet map in rmarkdown html
<p>I'd like to change the height and width of <code>leaflet</code> map outputs in html document. Is there a simple way to do this in R markdown without getting into whole CSS business?</p>

<pre><code>```{r}
library(leaflet)
library(dplyr)

m &lt;- leaflet() %&gt;% setView(lng = -71.0589, lat = 42.3601, zoom = 12)
m %&gt;% addTiles() 
```
</code></pre>

<p>Ideally, I want the width of map to be the same width of code block as shown below.</p>

<p><a href="https://i.stack.imgur.com/NzgJE.png" rel="noreferrer"><img src="https://i.stack.imgur.com/NzgJE.png" alt="enter image description here"></a></p>