let clicked_bnt = document.querySelectorAll('.button>li');
let selected_li = document.querySelectorAll('.block>li');
for (let i = clicked_bnt.length - 1; i >= 0; i--) {
clicked_bnt[i].addEventListener('click', function(y){
selected_li[i].style.textShadow = "2px 0px 5px #FF0000";
});
}