How to reduce spacing between items on one page only?

Site URL: https://www.thecarolamoon.com/must-have-brand-images-optin

I would like to reduce the spacing between items on this page only. I'm especially concerned about the spacing above the button, and below the "Find out..." copy (above the bullet list).

To reduce the button spacing/padding/margin, I've tried this code without much luck:
<style>.sqs-block-button .sqs-block-button-element--medium {
  padding:10px 25px !important;
  margin-top:-40px !important; 
  margin-bottom:-40px !important;
}
</style>

8 hours ago, tuanphan said:

Add to Design > Custom CSS

/* Find out padding */
div#block-yui_3_17_2_1_1624207270810_6104 {
    padding-top: 1px;
    padding-bottom: 1px;
}

 

Superb, this worked a treat! 😄  Thank you!