[BUG] Miscellaneous CSS issues

[uncheckederror]

There are a few issues with the CSS in WebTexting:

• The items in the Conversations list are offset on the left edge by a couple of pixels, when compared to the blue header above them.
• Inside of a item on the Conversations list, the content preview of the message extends all the way until the edge of the item without any padding or wrapping.
• The plus symbol icon for creating a new Conversation isn't centered on it's background circle. #70

[dunkeltron]

I've got these fixes scheduled for the next deployment.