The appearance of Minter.io can be set to either Light or Dark mode in your account settings, found here: https://minter.io/app/edit/appearance. By default the appearance is based on your current system settings.
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You can also find this settings area by following these steps:

1. Click your account name in the top right of your report.

2. Choose 'Appearance'.

3. Choose the mode you would like to use.