Live Demo: Bootstrap Login Form with Rounded Social Buttons

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Bootstrap Login Form with Rounded Social Buttons</title>
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:400,700">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script>
<style>
body {
	background: #dfe7e9;
	font-family: 'Roboto', sans-serif;
}
.form-control {
	font-size: 16px;
}
.form-control:focus {
	border-color: #5cb85c;
}
.form-control, .btn {
	border-radius: 50px;
	outline: none !important;
}
.login-form {
	width: 400px;
	margin: 0 auto;
	padding: 30px 0;
}
.login-form form {
	border-radius: 5px;
	margin-bottom: 20px;
	background: #fff;
	box-shadow: 0px 2px 2px rgba(0, 0, 0, 0.3);
	padding: 40px 50px;
}
.login-form .btn {        
	font-size: 18px;
	line-height: 26px;
	font-weight: bold;
	text-align: center;
}
.social-btn .btn {
	color: #fff;
	margin: 10px 0;
	font-size: 15px;
	border-radius: 50px;
	text-indent: 10px;
	font-weight: normal;
	border: none;
	text-align: center;		
}
.social-btn .btn:hover {
	opacity: 0.9;
}
.social-btn .btn-primary {
	background: #507cc0;
}
.social-btn .btn-info {
	background: #64ccf1;
}
.social-btn .btn-danger {
	background: #df4930;
}
.social-btn .btn i {
	margin-right: 9px;
	font-size: 20px;
	min-width: 25px;
	position: relative;
	top: 2px;
}
.or-seperator {
	margin: 50px 0 15px;
	text-align: center;
	border-top: 1px solid #e0e0e0;
}
.or-seperator b {
	padding: 0 10px;
	width: 40px;
	height: 40px;
	font-size: 16px;
	text-align: center;
	line-height: 40px;
	background: #fff;
	display: inline-block;
	border: 1px solid #e0e0e0;
	border-radius: 50%;
	position: relative;
	top: -22px;
	z-index: 1;
}
.login-form a {
	color: #5cb85c;
}
</style>
</head>
<body>
<div class="login-form">
    <form action="/examples/actions/confirmation.php" method="post">		
        <div class="text-center social-btn">
            <a href="#" class="btn btn-primary btn-lg btn-block"><i class="fa fa-facebook"></i> Sign in with <b>Facebook</b></a>
            <a href="#" class="btn btn-info btn-lg btn-block"><i class="fa fa-twitter"></i> Sign in with <b>Twitter</b></a>
			<a href="#" class="btn btn-danger btn-lg btn-block"><i class="fa fa-google"></i> Sign in with <b>Google</b></a>
        </div>
		<div class="or-seperator"><b>or</b></div>
        <div class="form-group">
        	<input type="text" class="form-control input-lg" name="username" placeholder="Username" required="required">
        </div>
		<div class="form-group">
            <input type="password" class="form-control input-lg" name="password" placeholder="Password" required="required">
        </div>        
        <div class="form-group">
            <button type="submit" class="btn btn-success btn-lg btn-block login-btn">Sign in</button>
        </div>
    </form>
    <div class="text-center"><span class="text-muted">Don't have an account?</span> <a href="#">Sign up here</a></div>
</div>
</body>
</html>