Did you want this image show wholly in mobile? Because the featured image will be filled into wrap firstly automatic, it is a fullscreen wrap for every device screen.
It has to set custom css to fit image for each page, if the image is 4:3, set it as 75 3/4=0.75:
@media (max-width: 767px) and (orientation: portrait) {
.page-id-907 .post-cover {
height: 75vw!important;
}
}
The 907 is the page’s ID, how find it?
Cheers!
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