@media screen and (min-width: 300px) {
.post-thumbnail
{
 background-image: none;
 background-color: transparent;
 max-width: 40%;
 display: block;
}
a.post-thumbnail:hover
{
 background-color: transparent; 
}
.wp-post-image, .post-thumbnail img
{
  width: auto;
}
.site-content .entry-header, .site-content .entry-content, .site-content .entry-summary, .site-content .entry-meta, .page-content {
    margin: 0 auto;
    max-width: 80%;
}  
}
@media screen and (min-width: 401px) {
	.post-thumbnail {
		display: none;
	}
  .entry-title
  {
   	margin-top: 1em; 
  }

}