Blur Form với HTML và CSS

1. HTML

<div class="content">
		<div class="title">Create account</div>
		<input type="text" placeholder="E-mail"/>
		<input type="password" placeholder="Password"/>
		<input type="checkbox" id="rememberMe"/>
		<label for="rememberMe"></label><span>I have read and agree to the <a href="#">Terms of Use </a>and <a href="#">Privacy Policy</a></span>
		<button>Create Account</button>
		<div class="social"> <span>or sign up with social media</span></div>
		<div class="buttons">
			<button class="facebook"><i class="fa fa-facebook"></i>Facebook</button>
			<button class="twitter"><i class="fa fa-twitter"></i>Twitter</button>
			<button class="google"><i class="fa fa-google-plus"></i>Google</button>
		</div>
		<div class="already">Already have an account? <a href="#">Sign In</a></div>
	</div>

2. CSS

@import url(https://fonts.googleapis.com/css?family=Dosis:300|Lato:300,400,600,700|Roboto+Condensed:300,700|Open+Sans+Condensed:300,600|Open+Sans:400,300,600,700|Maven+Pro:400,700);
		@import url("https://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css");
		* {
			-moz-box-sizing: border-box;
			-webkit-box-sizing: border-box;
			box-sizing: border-box;
		}

		html {
			background: black;
		}

		body {
			font-family: "Open Sans";
			font-size: 16px;
			color: White;
			font-smoothing: antialiased;
			font-weight: 600;
		}

		a {
			color: #BBB;
		}

		.content:before {
			content: "";
			position: fixed;
			left: 0;
			right: 0;
			top: 0;
			bottom: 0;
			z-index: -1;
			display: block;
			background-color: black;
			background-image: url("https://img.thuthuattinhoc.vn/uploads/2019/08/15/hinh-anh-con-duong-sang-som_064501073.jpg");
			width: 100%;
			height: 100%;
			background-size: 100% 100%;
			-webkit-filter: blur(2px);
			-moz-filter: blur(2px);
			-o-filter: blur(2px);
			-ms-filter: blur(2px);
			filter: blur(2px);
		}

		.content {
			position: absolute;
			top: 0;
			bottom: 0;
			left: 0;
			right: 0;
			width: 540px;
			height: 540px;
			background-color: rgba(10, 10, 10, 0.5);
			margin: auto auto;
			padding: 40px;
			-moz-border-radius: 4px;
			-webkit-border-radius: 4px;
			border-radius: 4px;
			-moz-box-shadow: 0 0 10px black;
			-webkit-box-shadow: 0 0 10px black;
			box-shadow: 0 0 10px black;
		}
		.content .title {
			text-align: center;
			font-size: 2.0rem;
			font-weight: 600;
			padding-bottom: 30px;
		}
		.content input {
			width: 100%;
			font-size: 1.2rem;
			font-family: "Open Sans";
			margin: 10px 0px;
			border: none;
			padding: 10px;
			-moz-border-radius: 4px;
			-webkit-border-radius: 4px;
			border-radius: 4px;
		}
		.content input[type=checkbox] {
			display: none;
		}
		.content label {
			display: inline-block;
			width: 20px;
			height: 20px;
			cursor: pointer;
			position: relative;
			margin-left: 5px;
			margin-right: 10px;
			top: 5px;
		}
		.content label:before {
			content: "";
			display: inline-block;
			width: 20px;
			height: 20px;
			-moz-border-radius: 3px;
			-webkit-border-radius: 3px;
			border-radius: 3px;
			position: absolute;
			left: 0;
			bottom: 1px;
			background-color: #aaa;
			-moz-box-shadow: inset 0px 2px 3px 0px rgba(0, 0, 0, 0.3), 0px 1px 0px 0px rgba(255, 255, 255, 0.8);
			-webkit-box-shadow: inset 0px 2px 3px 0px rgba(0, 0, 0, 0.3), 0px 1px 0px 0px rgba(255, 255, 255, 0.8);
			box-shadow: inset 0px 2px 3px 0px rgba(0, 0, 0, 0.3), 0px 1px 0px 0px rgba(255, 255, 255, 0.8);
		}
		.content input[type=checkbox]:checked + label:before {
			content: "\2713";
			text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.2);
			font-size: 20px;
			color: Black;
			text-align: center;
			line-height: 20px;
		}
		.content span {
			font-size: 0.9rem;
		}
		.content button {
			width: 100%;
			font-size: 1.1rem;
			padding: 10px;
			margin: 20px 0px;
			background-color: #66A756;
			color: White;
			border: none;
			-moz-border-radius: 4px;
			-webkit-border-radius: 4px;
			border-radius: 4px;
		}
		.content .social {
			width: 100%;
			position: relative;
			overflow: hidden;
			text-align: center;
		}
		.content .social span {
			display: inline-block;
			vertical-align: baseline;
			padding: 0 20px;
		}
		.content .social span:before, .content .social span:after {
			content: '';
			display: block;
			width: 500px;
			position: absolute;
			top: 0.9em;
			border-top: 1px solid White;
		}
		.content .social span:before {
			right: 75%;
		}
		.content .social span:after {
			left: 75%;
		}
		.content .buttons {
			width: 100%;
			margin: 30px 0px;
		}
		.content .buttons button {
			float: left;
			width: 30%;
			margin: 0px 1.5%;
		}
		.content .buttons button i {
			padding-right: 7px;
		}
		.content .buttons button.facebook {
			background-color: #4464B2;
		}
		.content .buttons button.twitter {
			background-color: #28A9E0;
		}
		.content .buttons button.google {
			background-color: #DA4735;
		}
		.content .buttons:after {
			content: "";
			display: block;
			clear: both;
		}
		.content .already {
			text-align: center;
			font-size: 0.9rem;
		}

3. JAVASCRIPT