04-隐藏的搜索小部件 Hidden Search Widget

index,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">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css" integrity="sha512-1PKOgIY59xJ8Co8+NE6FZ+LOAZKjy+KY8iq0G4B3CyeY6wYHN3yt9PW0XpSriVlkMXe40PTKnXrLnZ9+fkDaog==" crossorigin="anonymous" />
    <link rel="stylesheet" href="style.css">
    <title>Document</title>
</head>
<body>
    <div class="search">
        <input type="text" class="input" placeholder="Search...">
        <button class="btn">
            <i class="fas fa-search"></i>
        </button>
    </div>
    <script src="script.js"></script>
</body>
</html>

CSS

@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');

*{
    box-sizing: border-box;
}


body{
    background-image: linear-gradient(90deg,#7d5fff,#7158e2);
    font-family: 'Roboto',sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    margin: 0;
}

.search{
    position: relative;
    height: 50px;
}

.search .input{
    background-color: #fff;
    border: 0;
    font-size: 18px;
    padding: 15px;
    height: 50px;
    width: 50px;
    transition: width 0.3s ease;
}

.btn{
    background-color: #fff;
   border: 0;
   cursor: pointer;
   font-size: 24px;
   position: absolute;
   top: 0;
   left: 0;
   height: 50px;
   width: 50px;
   transition:transform 0.3s ease;
}

.btn:focus,.input:focus{
    outline: none;
}

.search.active .input{
    width: 200px;
}
.search.active .btn{
    transform: translateX(198px);
}

const search =document.querySelector('.search')
const btn =document.querySelector('.btn')
const input = document.querySelector('.input')

btn.addEventListener("click",()=>{
    search.classList.toggle('active')
    input.focus()
})