The good thing about using Bootstrap is that it lets us easily change the look and feel of the application using any available Bootstrap themes. Let's see how we can install a cool theme for our application, then we will also fine tune the styles to fit our needs using Sass variables provided by Bootstrap.
There are hundreds of Bootstrap themes out there. Since we are using Bootstrap 4 it is important to pick a theme that is made for Bootstrap 4.
Bootswatch is a nice collection of themes for Bootstrap; check it out to see all the available themes at: https://bootswatch.com/.
Let's use a Bootswatch theme called materia.
In your terminal, run yarn add bootswatch to install all the themes. Don't worry; we will only import the theme that we want to use so you do not have to worry about installing all...