Reducing space below showcase header/above content

You can add this into your child theme’s CSS:

#cir-content-wrapper {
     padding-top: 0px;
}

Adjust the number as necessary.

The original CSS is found around line 465 of the style.css:

#cir-content-wrapper {
	padding: 4em 0;
}

Just as Techievous posted, you can change the padding for the top, right, bottom, and left. It can be done like it was posted, or you can do in short hand style to manage padding on all sides:

#cir-content-wrapper {
	padding: 2em 0;
}

The above will give you a padding of 2em (approx: 32px) for the top and bottom and then 0 px on the left and right of the container. You can also do the exact same but in this way:

#cir-content-wrapper {
	padding: 2em 0 2em 0;
}