Steps to Reproduce:
1. Open https://en.m.wikipedia.org/w/index.php?title=Wikipedia&banner=B2021_0804_enJP_m_p1_lg_txt_cnt&country=JP
2. Select any donation amount
3. Select Visa payment method
4. When presented with the monthly modal prompt select the link that says "Yes, I’ll donate monthly, but for a different amount"
5. Enter a very large number in the input (ex: "99999999999999999999999999999999999999999999999999999999999999999999999999999999")
6. Observe numbers spill over on the donate button and appear behind the modal
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Actual Results:
Currently in the other monthly amount input, when a very large number is entered, the numbers spill over and appear behind modal (see screenshot above) on the Donate Monthly button
Expected Results:
The Donate Monthly button should use an e+ notation (so the above number would equal $1e+80), to avoid resizing and layout issues. Since our max donation allowed online is $12,000 however, this issue is an edge case that isn't realistic, although still might be worth considering, marking as "Lowest" priority.