The spacing options allow you to define the spacing of an HTML element.

Padding
The padding
property specifies the space within an element, between its content and its border. It adds extra space inside the border of an HTML element. The padding
values can be set in px
, em
, or %
units.
Padding Top
This field adds space between the HTML element and its top border.
Padding Right
This field adds space between the HTML element and its right border.
Padding Bottom
This field adds space between the HTML element and its bottom border.
Padding Left
This field adds space between the HTML element and its left border.
Link Sides
When the Link sides option is enabled, all top/right/bottom/left values will sync. This option helps you work more efficiently.

Margin
The margin
property specifies the space outside an element’s border. It is used to create space between elements and control the distance between them. The value of margin
property can be Auto
or numbers set in px
, em
, or %
units.
Margin Top
This field adds space outside the HTML element’s top border.
Margin Right
This field adds space outside the HTML element’s right border.
Margin Bottom
This field adds space outside the HTML element’s bottom border.
Margin Left
This field adds space outside the HTML element’s left border.
Link Sides
When the Link sides option is enabled, all top/right/bottom/left values will sync. This option helps you work more efficiently.

Border Size
The Border size option is using the border-width
CSS property which specifies the width of an element’s border. The border-width
values can be set in px
, em
, or %
units.
Border Top Width
This field specifies the width of the HTML element’s top border.
Border right Width
This field adds space outside the HTML element’s right border.
Border bottom Width
This field adds space outside the HTML element’s bottom border.
Border left Width
This field adds space outside the HTML element’s left border.
Link Sides
When the Link sides option is enabled, all top/right/bottom/left values will sync. This option helps you work more efficiently.

Border Radius
The border-radius
property sets the rounding of an element’s corners. It is used to create rounded corners on elements like boxes, buttons, or images. The border-radius
values can be set in px
, em
, or %
units.
Border Top Left Radius
This field defines how round the HTML element’s top left corner would be.
Border Top Right Radius
This field defines how round the HTML element’s top right corner would be.
Border Bottom Right Radius
This field defines how round the HTML element’s bottom right corner would be.
Border Bottom Left Radius
This field defines how round the HTML element’s bottom left corner would be.
Link Sides
When the Link sides option is enabled, all top/right/bottom/left values will sync. This option helps you work more efficiently.

Visit MDN Web Docs, W3Schools, and CSS-TRICKS to learn more about the options.