CSS效果：不怎么样的登录表单

HTML：

<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="style.css">
    <link href="https://cdn.bootcss.com/font-awesome/5.8.1/css/all.min.css" rel="stylesheet">
    <link href="https://fonts.font.im/css?family=Playfair+Display" rel="stylesheet">
    <script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
    <title>Document</title>
</head>

<body>
    <div class="login-box">
        <h1>Login</h1>
        <div class="text-box">
            <i class="fa fa-user fa1"></i>
            <input class="text-input1" type="text" placeholder="Username" name="" value="">
        </div>
        <div class="text-box">
            <i class="fa fa-lock fa2"></i>
            <input class="text-input2" type="password" placeholder="Password" name="" value="">
        </div>
        <input type="button" class="btn" value="Sign In">


    </div>
</body>

</html>

CSS：

body{
    margin:0;
    padding:0;
    font-family: 'Playfair Display', serif;
    background:url(./20.png);
    background-size: cover;
}
.login-box{
    width:280px;
    position: absolute;
    top:50%;
    left:50%;
    transform: translate(-50%,-50%);
    color:white;
}
.login-box h1{
    text-align: center;
    font-size :40px;
    border-bottom: 2px solid #2e86de;
    margin-bottom:50px;
    padding:13px 0;
}
.text-box{
    width:100%;
    overflow: hidden;
    font-size:20px;
    padding:8px 0;
    margin:8px 0;
   
}
.text-box i{
    vertical-align:middle;
    width:26px;
    float: left;
    text-align: center;
}
.text-box input{
    vertical-align:middle;
    border:none;
    outline: none;
    background:none;
    color:white;
    font-size:18px;
    width:80%;
    float: left;
    margin:0 10px;
    border-bottom: 1px solid #54a0ff;
    transition: 0.4s;
}
.btn{
    width:100%;
    height:50px;
    background:none;
    border:2px solid #54a0ff;
    color:white;
    padding:5px;
    transition: 0.4s;
    font-size:25px;
    cursor: pointer;
}
.text-box input:focus{
    border-bottom: 2px solid #1dd1a1;
    width:100%;
}
.btn:hover{
    background:white;
    border:none;
    color:black;
    outline: none;
}

JQuery：

        $(".text-input1").focus(function(){
            $(".fa1").hide();
        })
        $(".text-input1").blur(function(){
            $(".fa1").show(500);
        })
        $(".text-input2").focus(function(){
            $(".fa2").hide();
        })
        $(".text-input2").blur(function(){
            $(".fa2").show(500);
        })

效果图：

CSS效果：不怎么样的登录表单

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