×...........it is showing to me forward slash in span, div and p tag (both browsers chrome and firefox)

/* CSS Document */
@import url('https://fonts.googleapis.com/css?family=Exo+2');

body{
	margin: 0;
	padding: 0;
	font-family: 'Exo 2', sans-serif, arial, helvetica, roboto, callibri, verdana;
	text-align: center;
}


	button{
		background-color: #069;
		color: #FFF;
		width: 150px;
		height: 40px;
		border: none;
		margin: 0 auto;
		display: block;
		font-size: 16px;
		cursor: pointer;
	}



div#modal{
	background-color: #0004;
	width: 100%;
	height: 100%;
	position: fixed;
	top: 0;
	padding-top: 120px;
}

.img_contr{
	border: 1px solid red;
}

.close{
	float: right;
	font-size: 25px;
	font-weight: bold;
	width: 50px;
}

form {
	border: 1px solid #666;
	width: 60%;
	text-align: ;
	margin: 20px auto;
	padding: 20px;
	background-color: #fff;
	
}
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale= 1.0" />
<title>Login Form</title>
<link rel="stylesheet" href="style.css" type="text/css" />
</head>
	
<body>
	
    <h2>Modal Login Form</h2>
	<button>Login</button>
    
    <div id="modal">
    	
        <form action="action_page.php">
        	<div class="img_contr">
                <img src="https://dummyimage.com/200x200/000/fff" alt="magic" >
                <span class="close">&times;</span>
            </div>
            
            <label for="user_name">Username</label>
            <input type="text" placeholder="Enter Username" />
            <label for="user_pass">Password</label>
            <input type="password" placeholder="Password" />
            
        </form>
        
    </div>
    
</body>
</html>

this is my code and entity, it is showing to me forward slash in span, div and p tag (both browsers.. chrome and firefox)

I'm checking but not find answer to this question and sharing my code with you.. please help me...and I am new user of stackoverflow.com..

and last asking with you that I am writing this and it saying me that "it looks like your post is mostly code; please add some more details." so I am going write it? please tell me sir..