I solved all these problems. Now I need :
1. Where I need to put this in custom_section “background-position: center”? I need that in computer screen which width is less than image would show image center (now show left side).
2. In portfolio page is right sidebar. When I upload two featured images it becomes bigger and than my sidebar doesn’t fit. I want, that image would be of the same size that it was when was just one image.
Can you help me with these?