The input field borders are #ebebeb and the background color of the page is #000000. The contrast ratio between the two is 1.33, which is short of the 3:1 minimum set by WCAG success criterion 1.4.11.
The visual presentation of the following have a contrast ratio of at least 3:1 against adjacent color(s):
User Interface Components Visual information required to identify user interface components and states
Subjectively speaking, I found the contrast ratio here to be so low as to be borderline invisible. It's worth a second look!