How can I resize an Omnisend email capture embed?

Store Design
1

Ive added a email capture embed from omnisend on to my website laurlylou.com and that all went ok. But its gone full width and looks weird so wanted it smaller. Theres no option to resize it, does anyone have any idea how i can do this please

2

Please add below css in bottom of assets/base.css file

#shopify-section-template–15541096710318__1651063178e0f17c65 .color-background-1.gradient {

max-width: var(–page-width);

margin: 0 auto;

padding: 0 5rem;

}
Thank you.