Formulario de inicio de sesión CSS animado

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Formulario de inicio de sesión CSS animado

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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Animated Login Form</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #03e9f4;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background: linear-gradient(#141e30, #243b55);
            overflow: hidden;
        }

.login-box {
            position: relative;
            width: 400px;
            padding: 40px;
            background: rgba(0, 0, 0, .5);
            box-sizing: border-box;
            box-shadow: 0 15px 25px rgba(0, 0, 0, .6);
            border-radius: 10px;
            animation: fadeIn 1.2s ease-in-out;
        }

@keyframes fadeIn {
            from { opacity: 0; transform: translateY(-20px); }
            to { opacity: 1; transform: translateY(0); }
        }

.login-box h2 {
            margin: 0 0 30px;
            padding: 0;
            color: #fff;
            text-align: center;
        }

.login-box .user-box {
            position: relative;
        }

.login-box .user-box input {
            width: 100%;
            padding: 10px 0;
            font-size: 16px;
            color: #fff;
            margin-bottom: 30px;
            border: none;
            border-bottom: 1px solid #fff;
            outline: none;
            background: transparent;
            transition: 0.5s;
        }

.login-box .user-box label {
            position: absolute;
            top: 0;
            left: 0;
            padding: 10px 0;
            font-size: 16px;
            color: #fff;
            pointer-events: none;
            transition: .5s;
        }

.login-box .user-box input:focus ~ label,
        .login-box .user-box input:valid ~ label {
            top: -20px;
            left: 0;
            color: #03e9f4;
            font-size: 12px;
        }

.login-box form button {
            position: relative;
            display: inline-block;
            padding: 10px 20px;
            color: #03e9f4;
            font-size: 16px;
            text-decoration: none;
            text-transform: uppercase;
            overflow: hidden;
            transition: .5s;
            margin-top: 40px;
            letter-spacing: 4px;
            background: transparent;
            border: none;
            cursor: pointer;
            width: 100%;
        }

.login-box button:hover {
            background: #03e9f4;
            color: #fff;
            border-radius: 5px;
            box-shadow: 0 0 5px #03e9f4,
                        0 0 25px #03e9f4,
                        0 0 50px #03e9f4,
                        0 0 100px #03e9f4;
        }

.login-box button span {
            position: absolute;
            display: block;
        }

.login-box button span:nth-child(1) {
            top: 0;
            left: -100%;
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, transparent, #03e9f4);
            animation: btn-anim1 1s linear infinite;
        }

@keyframes btn-anim1 {
            0% { left: -100%; }
            50%, 100% { left: 100%; }
        }

.login-box button span:nth-child(2) {
            top: -100%;
            right: 0;
            width: 2px;
            height: 100%;
            background: linear-gradient(180deg, transparent, #03e9f4);
            animation: btn-anim2 1s linear infinite;
            animation-delay: .25s;
        }

@keyframes btn-anim2 {
            0% { top: -100%; }
            50%, 100% { top: 100%; }
        }

.login-box button span:nth-child(3) {
            bottom: 0;
            right: -100%;
            width: 100%;
            height: 2px;
            background: linear-gradient(270deg, transparent, #03e9f4);
            animation: btn-anim3 1s linear infinite;
            animation-delay: .5s;
        }

@keyframes btn-anim3 {
            0% { right: -100%; }
            50%, 100% { right: 100%; }
        }

.login-box button span:nth-child(4) {
            bottom: -100%;
            left: 0;
            width: 2px;
            height: 100%;
            background: linear-gradient(360deg, transparent, #03e9f4);
            animation: btn-anim4 1s linear infinite;
            animation-delay: .75s;
        }

@keyframes btn-anim4 {
            0% { bottom: -100%; }
            50%, 100% { bottom: 100%; }
        }
    </style>
</head>
<body>

<div class="login-box">
        <h2>Login</h2>
        <form>
            <div class="user-box">
                <input type="text" name="username" required="">
                <label>Username</label>
            </div>
            <div class="user-box">
                <input type="password" name="password" required="">
                <label>Password</label>
            </div>
            <button type="submit">
                <span></span>
                <span></span>
                <span></span>
                <span></span>
                Submit
            </button>
        </form>
    </div>

</body>
</html>

CSS