How to reduce space between slider and test?

Here is our page – https://www.lenco.co.uk

I want to reduce the space between the image slider at the top and the buttons underneath. Here is the code from the page.

This is the first time I have used WordPress so sorry if this is a stupid question!

[vc_row][vc_column width="1/1"][vc_column_text][su_slider source="media: 925,924,923,919,920,921,922,918" title="no" arrows="no" pages="no" mousewheel="no"][/vc_column_text][/vc_column][/vc_row][vc_row][vc_column width="1/4"][vc_column_text][su_button url="https://www.lenco.co.uk/way-finding/" style="glass" background="#cc3399" size="5" wide="yes" center="yes" radius="5"]Wayfinding[/su_button][/vc_column_text][/vc_column][vc_column width="1/4"][vc_column_text][su_button url="https://www.lenco.co.uk/branding/" style="glass" background="#cc3399" size="5" wide="yes" center="yes" radius="5"]Branding & Graphics[/su_button][/vc_column_text][/vc_column][vc_column width="1/4"][vc_column_text][su_button url="https://www.lenco.co.uk/digital-media/" style="glass" background="#cc3399" size="5" wide="yes" center="yes" radius="5"]Digital Media[/su_button][/vc_column_text][/vc_column][vc_column width="1/4"][vc_column_text][su_button url="https://www.lenco.co.uk/project-management-2/" style="glass" background="#cc3399" size="5" wide="yes" center="yes" radius="5"]Project Management[/su_button][/vc_column_text][/vc_column][/vc_row][vc_row][vc_column width="1/1"][vc_column_text]Lenco International is a globally active Graphic Design Consultancy specialising in the design of Branding, Wayfinding Systems and Signage.

Examples of our creativity can be found in the premier private hospital in Dubai, international hotels in the heart of London, the tables of Michelin-starred restaurants and throughout the world’s most successful cruise ships.

We also offer branding design services that effectively translate corporate values, offerings and aspirations into a single defining graphic. Our branding design objectives are totally focused on combining immediate visual impact with memorable message delivery.

What we bring to every signage and graphics design commission is not just creative flair and commercial understanding, but also our ability to ‘turnkey’ project manage the total design development and application process on our clients’ behalf, anywhere across the globe.[/vc_column_text][/vc_column][/vc_row]