style.css

body{
	margin: 0;
	padding: 0;
	font-family: sans-serif;
	background: #34495e;
}

.box{
	width: 300px;
	padding: 40px;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%,-50%);
	background:#191919;
	text-align: center; 
}
.box h1{
	color: white;
	text-transform: uppercase;
	font-weight: 500;
}

.box input[type="text"],.box input[type="password"]{
	border: 0;
	background: none;
	display:block;
	margin:20px auto;
	text-align:center;
	border: 2px solid #3498db;
	padding:14px 10px;
	width:200px;
	outline:none;
	color:white;
	color:white;
	border-radius:24px;
	transition:.25s;
}


.box input[type="text"]:focus,.box input[type="password"]:focus{
	width: 280px;
	border-color: #2ecc71;

}


.box input[type="submit"]{
	border:0;
	background: none;
	display:block;
	margin:20px auto;
	text-align:center;
	border: 2px solid #3498db;
	padding:14px 10px;
	width:200px;
	outline:none;
	color:white;
	border-radius:24px;
	transition:.25s;
	cursor: pointer;
}

.box input[type="submit"]:hover{
	background: #2ecc71;
}