Also if you use bigger logo you should use “Flat” header for this. Beacuse when the “Sticky” header will be fit your logo automatically to the theme.

Also you can write a custom css in the theme options custom css section like below:

.img-logo img {
    height: 120px;
}

If you use Flat header your header will be fit the logo. I hope that helps to you. If you have any questions please let us know.

Best Regards
ThemeofWP.com Team