Reply To: Logo in the top corner is verry small.

@bruersgeert: Login to your WordPress Admin. Go to Appearance => Customize => Additional css and add the following css.

.custom-logo {
  max-width: 100px;
}
.site-header-main .site-branding {
  padding-bottom: 0;
}

Let me know if this resolves your issue

Regards,
Tikaram