Yea this this possible with the following CSS:
.featured-image {
overflow: visible;
padding: 0;
height: auto;
line-height: 0;
text-align: center;
> img,
> a > img {
position: static;
height: auto;
width: auto;
object-fit: contain;
}
> a {
position: static;
}
}
This is going to make all of the Featured Images use their natural size/dimensions. There is also a feature in Author Pro that lets you change the Featured Images to any of 11 different aspect ratios (including a natural dimension option).
The main content is further to the left on purpose as part of the design (based on the Van de Graaf Canon), but you can change this with the following CSS:
@media all and (min-width: 71.875em) {
.main {
padding: 3em 5.555% !important;
}
}