This issue pertains to the following package(s):

• GraphQL Playground - Electron App
• GraphQL Playground HTML
• GraphQL Playground
• GraphQL Playground Express Middleware
• GraphQL Playground Hapi Middleware
• GraphQL Playground Koa Middleware
• GraphQL Playground Lambda Middleware

What OS and OS version are you experiencing the issue(s) on?

Ubuntu 18.04 (under Firefox and Chrome).

What version of graphql-playground(-electron/-middleware) are you experiencing the issue(s) on?

graphql-playground-html 1.6.0 (as a dependency of apollo-server).

What is the expected behavior?

A cursor is displayed where I input the text.

What is the actual behavior?

No cursor is visible, I don't know where the text I type will be inserted.
In the HTML, the cursor is present and blinking, but with transparent background-color.

What steps may we take to reproduce the behavior?

Open GraphQL Playground.

Please provide a gif or image of the issue for a quicker response/fix.

(it's a static image, but a video gives the same result)