Guys help out. There is a site that I create. Made the logo saved in .png and uploaded to the site. From the computer, everything looks superbly, but from the mobile version of the site is blurry. In this case, I used the tag <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"> . I checked the code from sites like VK and FACEBOOCK, the html code and css are exactly the same. What to do? I will add: here are the screenshots of the PC version: 
Well, the mobile version: (Yes, the line is black, I just test @media) 
The image of the logo has become muddy as well as the image of the captcha.

