Below are some sliders to play around with some
box-shadow values. In this case, I use 5 values to set the box shadow:
spread radius and
color. This is the full declaration of a CSS box shadow with all of its properties.
Optionally, you can have an inset
box-shadow by placing
inset at the start of the box shadow value. This places the box shadow inside of the element.
Note: Having a negative blur radius is invalid and will result in your box shadow to not render.