Would love this as well.
Edit: @dubinindmitry has a very elegant solution for this in his Obuntu theme. To your obsidian.css
, add:
/* Enlarge image on hover */
.markdown-preview-view img {
display: block;
margin-top: 20pt;
margin-bottom: 20pt;
margin-left: auto;
margin-right: auto;
width: 50%; /*experiment with values*/
transition: transform 0.25s ease;
}
.markdown-preview-view img:hover {
-webkit-transform: scale(2); /* experiment with values */
transform: scale(2);
}