What is a one-sentence summary of the following article?
Visit the Gmail website (mail.google.com. Google Inbox doesn't have a direct setting or configuration to change fonts, so this has to be done in Gmail. Under the "Sign In" box, type in your Gmail email address and password. This is your one Google ID for all of Google's services. Click the "Sign in" button to proceed. If you're already signed in to your Google account, this step won't be necessary. Click the gear button on the top right corner of your inbox then click "Settings" from the menu. You will be brought to the settings page for your Gmail account. Under the General Settings tab, scroll to the "Default text style" setting. You will be able to see the current font style, size, and color for your emails. There's also a sample text showing you how it actually looks like. Once you're done, scroll to the bottom of the page and click the "Save Changes" button. This is the font used now in your emails for both in Gmail and Inbox.

Summary:
Go to Gmail. Sign in. Go to Settings. View the default text style. Save your changes.