The Spacer web part gives you control over how much vertical space is shown between web parts.
Add the spacer web part
If you're not in edit mode already, click Edit at the top right of the page.
Hover your mouse above or below an existing web part or under the title region, click , and then select the Spacer web part.
Drag the gray bar up or down for vertical space; drag the corner boxes in or out for horizontal space. Or, use the up and down arrow keys to resize.