how to change header size on mobile version?

[Leon_baric]

I want to make bigger header.

https://baricexpress.myshopify.com/

[GemPages]

Hello @Leon_baric 

You can follow these steps: 
1. Go to Online Store->Theme->Edit code

2. Open your theme.liquid file, paste the below code before </body>

<style>
@media (max-width: 767px ) {
.site-header {
    height: 80px !important;
}
}
</style>

I hope the above is useful to you.

Kind & Best regards, 
GemPages Support Team