Trying to adjust only top on site margin/spacing

Site URL: http://liaheinze.com

Hello! I'm trying to reduce only the top margin on my Design main page and Photo main page (tabs in my nav bar). I want to pull the block of images up closer towards the nav bar but cannot figure out how to adjust.. 

Add to Page Settings > Advanced > Header (If you use Personal Plan > Edit Page > Add Code Block)

<style>
  .gallery-masonry {
    padding-top: 0 !important;
}
</style>

@tuanphan
Thank you, Thank you! Worked perfectly.