My text box position becomes unaligned when I go between full size screen and window

Site URL: https://www.cafe-mountain.com/newarrivals

I have a text box at the top of my shop. It looks aligned perfectly in when not full screen, however, when you go full screen the formatting changes
 

See images of window / full screen attached.

Any help?

You try this code to Website Tools > Custom CSS

@media screen and (min-width:992px) {
.fe-66def49c5da7932f84ba0059 {
    max-width: calc(~"100% - 300px");
    margin-left: auto;
}
}