How to get the basic example Shiny app working? : <p>I can't make the first example of the first Shiny Tutorial to work.... on windows 10, R 3.6.1</p>

<p>I followed : <a href="https://shiny.rstudio.com/tutorial/written-tutorial/lesson1/" rel="nofollow noreferrer">https://shiny.rstudio.com/tutorial/written-tutorial/lesson1/</a></p>

<p>I get some part of the app : title / input field... no CSS, not working... only the title as shown below : :-( </p>

<p><a href="https://i.stack.imgur.com/5drvp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5drvp.png" alt="enter image description here"></a></p>
