Resizing Pique theme logo

Hi. Can someone help me resize my logo in Pique theme?
Someone advised me to use the following but it hasn’t worked – logo is still the same size;

.site-branding .site-logo-link img {
max-height: 170px;
}

@media (min-width: 768px) {
.site-branding .site-logo-link img {
max-height: 170px;
}
}

My site is https://cashmerestudio.000webhostapp.com/

I want to make my logo about the same size as the logo in the original Pique theme: https://wordpress.com/theme/pique . It think its around 600x450px which is what i formatted my logo as.

The page I need help with: [log in to see the link]