Ah I see, GP theme makes the image height automatically adjust to fit the space where it’s in.
So 225px in height has reached the max when the container is 20% in width.
The bigger the container width is, the bigger the image will show, until it reaches its original size (400px in height in this case).
Although you can manually make it to 400px in height by adding this CSS, but the ratio of image might change.
.wp-image-9 {
height: 400px;
}
Let me know ๐