how to match both the filter value to lower case

    function filterResults() {
        const filter1Value = filter1.value;
        const filter2Value = filter2.value;
        // Get values of additional filters as needed
        filteredList.forEach((el) => {
            if (
                el.classList.contains(`${filter1Value.toLowerCase()}`) &&
                el.classList.contains(`${filter2Value.toLowerCase()}`)
            ) {
                el.style.display = "block";
            } else {
                el.style.display = "none";
            }
        });
    }

    function filterResults() {
        const filter1Value = filter1.value;
        const filter2Value = filter2.value;
        // Get values of additional filters as needed
        filteredList.forEach((el) => {
            if (
                el.classList.contains(`${filter1Value.toLowerCase()}`) &&
                el.classList.contains(`${filter2Value.toLowerCase()}`)
            ) {
                el.style.display = "block";
            } else {
                el.style.display = "none";
            }
        });
    }