How to center the donation form on my Squarespace page

To center the donation form on Squarespace, add the following styles after the embed form code in the code box:

<style>

iframe[name=donorbox]{
max-width: 425px !important;
display: block;
margin: auto;
}

</style>

Example:

Note: This is applicable only if the Show campaign description and legal disclaimer is not selected when generating the embed code