Can anyone please suggest me themes for my client.

Hello everyone,
Can anyone please suggest me a dark mode theme for my client. Previously we tried to edit the template that he has made available to us , but he wasn't satisfied with our work, so we thought we should just make a new site using new template.
His site is based on hosting and domain and his company provides these services to clients.
His preferred style of theme is dark mode and suggested and recommend colors are black purple , yellow and white, for the colour scheme.
Can anyone please suggest us some things that can be used . Paid will work also.