avascript -->
    <script>
        var borderElement = document.getElementById('borders');
        var effectElement = document.getElementById('margin-effect');
        var marginElement = document.getElementById('margins');
        const showBorder = () => {
            borderElement.style.border = '2px solid black';
        }
        effectElement.addEventListener('mouseover', function() {
            effectElement.style.background = 'black';
            marginElement.style.margin = '10px';
        });
  