Customized Styling for Image block buttons

Site URL: https://aardvark-eagle-4dcr.squarespace.com/

I am trying to add a gradient to the button in the image below and when i do it expands the button to the right hand side of the page. Any help on how I can fix this?

What is access password?

@tuanphan wendy

I see button fine here. Do you still need help on this?

Yes. The button is supposed to have a gradient @tuanphan

It is supposed to have same gradient as the form button lower on the page. @tuanphan

Add to Home > Design > Custom CSS

div#block-838722146b15cb60574e a {
    background-image: linear-gradient(90deg,#021c36 0%,#032e5b 100%);
}