This CSS code applies a style rule to `<span>` elements...

This CSS code applies a style rule to <span> elements that are inside an element with the class name buttons:

• Selector: .buttons span targets all <span> elements that are descendants of any element with the class buttons.

• Style: margin-bottom: 10px; means that there will be a space of 10px below each targeted <span> element.

In summary, this rule ensures that there is a gap of 10 pixels below each <span> inside a container with the class buttons.