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(1.8); /* experiment with values */
transform:scale(2);
}