For cards in mobile view, I did this:
//create conversation cards
.topic-body{
-webkit-box-shadow: 0 2px 5px 0 rgba(0,0,0,0.16),0 2px 10px 0 rgba(0,0,0,0.12);
-moz-box-shadow: 0 2px 5px 0 rgba(0,0,0,0.16),0 2px 10px 0 rgba(0,0,0,0.12);
box-shadow: 0 2px 5px 0 rgba(0,0,0,0.16),0 2px 10px 0 rgba(0,0,0,0.12);
background-color: lighten($secondary, 10%);
margin-top: 10px;
padding-left: 20px;
border-radius: 2px;
padding-right: 20px;
}
//improve format of embedded posts
.embedded-posts .topic-avatar{
padding-left: 0px;
}
.embedded-posts.top.topic-body {
-webkit-box-shadow: 0 2px 5px 0 rgba(0,0,0,0),0 2px 10px 0 rgba(0,0,0,0);
-moz-box-shadow: 0 2px 5px 0 rgba(0,0,0,0),0 2px 10px 0 rgba(0,0,0,0);
box-shadow: 0 2px 5px 0 rgba(0,0,0,0),0 2px 10px 0 rgba(0,0,0,0);
background-color: $secondary;
}
.small-action {
border: none;
}
#topic-closing-info {
border: none;
}
//remove lines between cards
.topic-post article {
border: none;
}
//put shadow on quotes as well
aside.quote {
-webkit-box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.16), 0 2px 10px 0 rgba(0, 0, 0, 0.12);
-moz-box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.16), 0 2px 10px 0 rgba(0, 0, 0, 0.12);
box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.16), 0 2px 10px 0 rgba(0, 0, 0, 0.12);
}