Hi there,
The difference between 2 is the stack that they are used in. The old website uses the Ethos stack but the new one uses the Integrity stack. To change the stack you can go to Pro > Launch > Theme Options and the first option is called STACK which you can choose the stack you want.
If you want to keep the integrity stack instead of the Ethos then kindly add the CSS code below to Pro > Launch > Theme Options > CSS to have a somewhat similar view:
.single-post .entry-thumb {
background-color: transparent;
}
.single-post .entry-thumb img {
min-width: auto;
margin: auto;
display: block;
}
If you do not want the image to be centered remove this portion of the code:
margin: auto;
display: block;
Thank you.