Here’s how to change the default font in your Gmail, so you don’t have to manually choose it every time:
Step 1:
Log in to Gmail from your Web browser.
Step 2:
Open the Mail settings menu in the upper right-hand corner.
Step 3:
On the General tab of the settings, find “Default text style.”
Step 4:
Adjust the font-face, size, style, and color of the text to your liking.
Step 5:
Enjoy composing e-mail with your preselected text style every time!