Icon of text editor is not showing in a theme.

Hi,
I have installed a theme in my localhost wordpress Version-4.1 In my theme’s user panel there is a custom page to write posts. In this page text editor’s icons are not showing. There are square boxes instead of icons. I have tried in all browsers but the problem remains. In my console there are no errors but this line “Consider using ‘dppx’ units, as in CSS ‘dpi’ means dots-per-CSS-inch, not dots-per-physical-inch, so does not correspond to the actual ‘dpi’ of a screen. In media query expression: print, not all, (-webkit-min-device-pixel-ratio: 1.25), (min-resolution: 120dpi)”