Site Logo max Size

Hi! Is it possible to resize ONLY the site logo? I want it to be only 50% width. At the moment I’ve tried it with:

img {
    max-width: 50%;
    height: auto;
    margin-left: 25%;
}

but this effects every image. How can I apply these change only to the site logo?

Kind regards,
Timon

I’ve found a solution myself.

img {
  max-width: 50%;
  height: auto;
  /*margin-left: 25%;*/
  display: block;
  margin-left: auto;
  margin-right: auto;
}

Nevertheless, thank you for your support!
Regards,
Timon