function updateHeaderHeight() {
        // Get the height of #brx-header
        const headerHeight = document.querySelector('#brx-header').offsetHeight;
          
        // Store the height in the CSS custom property --header-height
        document.documentElement.style.setProperty('--brxw-header-height', headerHeight + 'px');
    }

    // Execute the function as soon as the document is ready
    document.addEventListener('DOMContentLoaded', function() {
        updateHeaderHeight();  // Initial update of header height when the document is ready

        // Update the header height on window resize and orientation change
        window.addEventListener('resize', updateHeaderHeight);
        window.addEventListener('orientationchange', updateHeaderHeight);
});

Van Conversion Guides: Get a van

How to choose the right van for your conversion. Compare popular models, check for rust and common issues, and learn what to look for before you hand over your money.