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On 7/17/2017 at 12:56 PM, Loboo said:

Try this 

  $( '#products' ).on( 'click', '.js-search-link', function( event ) {
    var target = $( "#header" );
    if ( target.length ) {
      event.preventDefault();
      $( 'html, body' ).animate( {
        scrollTop: target.offset().top+300
      }, 1000 );
    }
  });

Worked for me on PrestaShop 1.7.7.1

I added to code to /themes/core.js

Thanks !