Search module is displayed on desktop but not on mobile

[vode11]

Hello

I would like to ask for your help. I installed a search module that displays correctly on desktop but does not display on mobile despite the mobile option being activated.

I think there is a code in the theme's css that hides the module display on mobile. But I don't know how to detect the problem css code. Help me display the module on mobile please.

Here is the link of the site https://livreparterre.com/

Thank you in advance.

[SmartDataSoft]

In your theme the header is hide with this code, so you need to edit the code and show your header to display:block

@media (max-width: 991px){
#header .header-top {
    background: #f1f1f1;
    padding-bottom: 0;
    display: none;
}
}