<style>
.circle {
width: 100px;
height: 100px;
background-color: #2196F3;
border-radius: 50%;
transition: transform 0.5s;
}
.enlarge {
transform: scale(2, 0.5);
}
</style>
</head>
<body>
<a href="#" onClick="window.history.go(-1);">Home</a><br>
<div class="circle" id="circle"></div>
<button onclick="document.getElementById('circle').classList.toggle('enlarge')">Scala</button>