W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<body>

<div class="w3-container">
  <h2>W3.CSS Login Modal</h2>
  <button onclick="document.getElementById('id01').style.display='block'" class="w3-button w3-green w3-large">Login</button>

<div class="w3-center"><br>
        <span onclick="document.getElementById('id01').style.display='none'" class="w3-button w3-xlarge w3-hover-red w3-display-topright" title="Close Modal">&times;</span>
        <img src="img_avatar4.png" alt="Avatar" style="width:30%" class="w3-circle w3-margin-top">
      </div>

<form class="w3-container" action="/action_page.php">
        <div class="w3-section">
          <label><b>Username</b></label>
          <input class="w3-input w3-border w3-margin-bottom" type="text" placeholder="Enter Username" name="usrname" required>
          <label><b>Password</b></label>
          <input class="w3-input w3-border" type="password" placeholder="Enter Password" name="psw" required>
          <button class="w3-button w3-block w3-green w3-section w3-padding" type="submit">Login</button>
          <input class="w3-check w3-margin-top" type="checkbox" checked="checked"> Remember me
        </div>
      </form>

<div class="w3-container w3-border-top w3-padding-16 w3-light-grey">
        <button onclick="document.getElementById('id01').style.display='none'" type="button" class="w3-button w3-red">Cancel</button>
        <span class="w3-right w3-padding w3-hide-small">Forgot <a href="#">password?</a></span>
      </div>

</div>
  </div>
</div>
            
</body>
</html>