Environment: SharePoint 2013

I`ve 2 webparts created in SPS2013, in order to align the webpart on my SharePoint homepage. I had set the width of webpart 1 using CSS. However that impact the size of the other webpart. Reason - value: div.section-content-wrap (responsible for the body of the webpart) is set as the same value for both webpart.

My CSS Code -

code

div.section-content-wrap { height: 400px; }

Please suggest how can I just decrease or increase the height of content area for Webpart 1 only?