web/signup.html

<!DOCTYPE html>

<head>
<link rel='stylesheet' href='static/css/main.css'>
</head>
<body>

<form  style="border:1px solid #ccc" method='post' action='static/php/signup.php'>
  <div class="container">
    <h1>Sign Up</h1>
    <p>Please fill in this form to create an account.</p>
    <hr>
    <label for="username"><b>username</b></label>
    <input type="text" placeholder="username" id="usernamefield" name='username' required>

    <label for="psw"><b>Password</b></label>
    <input type="password" placeholder="password" id="passwordfield" name='password' required>

    <label for="psw-repeat"><b>Repeat Password</b></label>
    <input type="password" placeholder="Repeat Password" id="psw-repeat" required>

    <p>By creating an account you agree to our <a href="#" style="color:dodgerblue">Terms & Privacy</a>.</p>
    <p>Already have an Account? <a href="signin.html" style="color:dodgerblue">Sign In</a>.</p>

    <div class="clearfix">
      <button type="button" class="cancelbtn">Cancel</button>
      <button  id="signup" class="signupbtn" type="submit">Sign up</button>
    </div>
  </div>
</form>
</body>
</html>