Hi there!
Did you mean these things? https://prnt.sc/eOaROlSwx3Fh
The space indicates top padding value of the main section. So you can use the following code to remove the space:
#sp-main-body {
padding: 0;
}
Note: Path towards custom CSS(Joomla 3): Extensions>Templates>Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.
You can turn those social icons off from the Blog tab of your Template Options. Here is a screenshot for your: https://prnt.sc/eJVhFdxy1Qtd
Best Regards