Can I DevTools?
CSS
Edit
  1. Inspect the element with box shadow > In the Styles pane, click the icon next to the box-shadow property to open the box shadow editor.
  2. Change the shadow properties:
    • Type (only for box-shadow). Pick Outset or Inset.
    • X and Y offsets. Drag the blue dot or specify values.
    • Blur. Drag the slider or specify a value.
    • Spread (only for box-shadow). Drag the slider or specify a value.