CSS 스타일링

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>

*{
margin: 0;
padding: 0;
box-sizing: border-box;
}

.btn_wrap{
width: 150px;
height: 60px;
background-color: gray;
margin: 100px auto;
border-radius: 50px;
position: relative;
transition: 0.5s;
display: block;
cursor: pointer;
}

.btn{
width: 50px;
height: 50px;
border-radius: 50%;
background-color: white;
position: absolute;
top: 5px;
left: 5px;
transition: 0.5s;
}

#check{
display: none;
}

#check:checked ~ .btn_wrap{
background-color: green;
}

#check:checked ~ .btn_wrap .btn{
left: 95px;
}

</style>
</head>
<body>

<input type="checkbox" id="check">

<label for="check" class="btn_wrap">
<div class="btn"></div>
</label>

</body>
</html>