Box-shadow, one of CSS3's best new features - CSS3 . Info
Top Shadow | CSS-Tricks - CSS-Tricks
CSS : CSS3 Box Shadow on Top, Left, and Right Only - YouTube
How to add a box-shadow on one side of an element using CSS? - GeeksforGeeks
Pratham on Twitter: "STEP 4: The input fields are going to have a sunken effect. And to achieve this, we will use an inset box-shadow. As light is coming from the top-left
Using box-shadow to construct a border | Codementor
Expanded Use of `box-shadow` and `border-radius` | Modern CSS Solutions
3 ways to style CSS box-shadow effects - LogRocket Blog