solution found: was the PHP 7.1 so i went back to PHP 7.0 and everything works fine.
You can change the size of the header in the file styles.css
go to chapter 4.1
here you find the needed settings:
/**
* 4.1 Site Header
* —————————————————————————-
*/
.site-header {
position: relative;
}
.site-header .home-link {
color: #141412;
display: block;
margin: 0 auto;
max-width: 1080px;
min-height: 150px;
padding: 0 20px;
text-decoration: none;
width: 100%;
}
