hoverTabs.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Hoverable Vertical Tabs</title>
    <style>
        *{
            margin: 0;
            padding: 0;
            font-family: poppins;
        }
        .tab{
            float: left;
            width: 20%;
            height: 300px;
            border: 1px solid #ccc;
            background-color: #f1f1f1;
        }
        .tablinks{
            border: none;
            outline: none;
            background-color: inherit;
            padding: 22px 16px;
            width: 100%;
            color: black;
            font-size: 17px;
            float: left;
            display: block;
            text-align: left;
            cursor: pointer;
        }
        .tab button:hover{
            background-color: #ddd;
        }
        .tab button.active{
            background-color: #ccc;
        }
        .tabcontent{
            height: 300px;
            width: 70%;
            float: left;
            padding: 0px 12px;
            border-left: none;
            display: none;
            border: 1px solid #ccc;
        }
        h2{
            font-size: 3rem;
            
        }
    </style>
</head>
<body>
    <!-- Tab links  -->
    <div class="tab">
        <button class="tablinks" onmouseover="openCity(event,'London')" id="default">London</button>
        <button class="tablinks" onmouseover="openCity(event,'Paris')">Paris</button>
        <button class="tablinks" onmouseover="openCity(event,'Tokyo')">Tokyo</button>
    </div>
    <!-- Tab content  -->
    <div id="London" class="tabcontent"><h2>London</h2><p>London is the capital city of England.</p></div>
    <div id="Paris" class="tabcontent"><h2>Paris</h2><p>London is the capital of France.</p></div>
    <div id="Tokyo" class="tabcontent"><h2>Tokyo</h2><p>London is the capital of Japan.</p></div>

    <!-- script  -->
    <script>
        function openCity(evt,cityName){
            var i,tablinks,tabcontent;
            // Hide all the elements with class = "tabcontent" 
            tabcontent= document.getElementsByClassName("tabcontent")
            for(i=0;i<tabcontent.length;i++){
                tabcontent[i].style.display= "none";
            }
            // Get all the tablinks and remove the class active from them
            tablinks= document.getElementsByClassName("tablinks");
            for(i=0;i<tablinks.length;i++){
                tablinks[i].className.replace(" active","");
            }
            // Show the current tab 
            document.getElementById(cityName).style.display= "block";
            evt.currentTarget.className+= " active";
        }
    </script>
</body>
</html>