[Technical bug] - Remove borders from images

## URL (on blog.dapr.io)

https://blog.dapr.io/posts/2021/02/09/running-dapr-in-production-at-roadwork/

## Expected Behavior

No border around the Roadwork logo

## Actual Behavior

There is a gray border around the image

## Steps to Reproduce the Problem

## Additional information
Should be some override we add in the CSS

Open the reported blog post URL and inspect the blog's CSS rules affecting the Roadwork logo image. Reproduce the gray border, identify the relevant styling, and verify that the logo displays without a border while other image behavior remains unchanged.

Written by the indexing model from the issue text.