We need to add background-size: 100%; to the placeholders, and set width: auto on images. Also, we need to right align the images on the right sides

Can you please provide additional context around issue? Perhaps screenshots showing the issue and build info if unique. Thanks!

Sorry, there are two placeholders for incoming video and audio messages, these are just some css tweaks discussed with borja that were needed to these elements - It's a fairly tiny fix. Basically when the high DPI devices are used, (or the responsive.css) the sizes of the background images are wrong, also image messages don't get the right width/height at the moment

It seems the background image placeholders already set background-size: 100% and width: auto now. I'll submit another patch for right align the images in outgoing message.

Comment on attachment 750891 [details] Right align the media content in outgoing message r=me with the nit addressed please fix the nit and then you can land without a review :)

Land in master: df3d2e10132cf05b9cdcf7032a0657c5f109e948

v1-train:e259573