The donation amounts should stand out on your page. There should be no distraction around this area, leaving your donation form the space to shine. It a good practice to provide your donors giving levels, guiding them in deciding how much they to give.
Most of the top 100 nonprofits use an approach that includes 4-5 suggested donation amounts paired with the option to enter a custom amount. About half of these organizations highlighted a default suggested amount (usually the 2nd or 3rd option).
Make it easy for the donor.