This is where you can customize the container styling.
-Normal & Hover : Select​ which widget state you want to customize.Normal for the idle state of the widget and hover for when the widget is being hovered.Note that all the remaining options of this section will only affect the selected state.
-Background : Customize the container background & choose to apply either a solid or a gradient color.
-Radius, Borders & Shadows : Control the container's border and apply custom box shadows.The option to change the shape of the container is also possible by changing the border radius value.
