I have the same question and hope someone will have an answer for us soon.
EDIT: I don’t know if this is will work for everyone, but I just went to extra.less and added these -
Code:
.message--articlePreview .articlePreview-image {
width: 95%;
margin-top: 15px;
}
.message--articlePreview .articlePreview-title {margin: 0 5px;}
.message--articlePreview .articlePreview-image + .articlePreview-text .bbWrapper {margin: 0 5px;}
.block--previews .block-body > .message--articlePreview:first-of-type .articlePreview-image {margin: 15px;}