Logo Size

Hey!

I want my logo to be bigger but I don’t know what to do anymore.
The logo is in full size and I’ve already tried these codes that I found in the forum:

.header-style-default .site-title img{
max-height: 450px
}

and after I tried

.site-branding {
width: 30%;
}
.main-navigation {
width: 70%;
}

and after I tried

.header-style-default .site-title img {
max-height: 120px;
}
@media (min-width: 992px) {
.header-style-default .site-title img {
max-height: 200px;
}
}

But ever time I get the following message in the site:

Parse error: syntax error, unexpected ‘.’ in /home/maede407/public_html/wp-content/themes/elegance-childtheme/custom-functions.php on line 18

My blog is verdadesdemae.com.br

Is there any other code that I can use?
Thanks