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HTML

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <!-- Look at console -->
<html>
<head>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  <link href="style.css" rel="stylesheet" type="text/css">
  <script> </script>
</head>
<body>
<div class="login-page">
  <div class="form">
    <form class="register-form">
      <input id="create-username" type="text" placeholder="username"/>
      <input id="create-password" type="text" placeholder="password"/>
      <input id="create-email" type="text" placeholder="email address"/>
      <button name="create-button" type="button" id="create-button">create</button>
      <p class="message">Already registered? <a href="#">Sign In</a></p>
    </form>
    <form class="login-form">
      <input id="login-username" type="text" placeholder="username" name="login-username"/>
      <input id="login-password" type="text" placeholder="password" name="login-password"/>
      <button name="login-button" type="button" id="login-button">login</button>
      <p class="message">Not registered? <a href="#">Create an account</a></p>
    </form>
  </div>
</div>
</body>
</html>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Roboto:300);
/* Look at console */
.login-page {
  width: 360px;
  padding: 8% 0 0;
  margin: auto;
}
.form {
  animation-name: launch;
  animation-duration: 4s;
  position: relative;
  z-index: 1;
  background: #FFFFFF;
  max-width: 360px;
  margin: 0 auto 100px;
  padding: 45px;
  text-align: center;
  box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.2), 0 5px 5px 0 rgba(0, 0, 0, 0.24);
}
.form input {
  font-family: "Roboto", sans-serif;
  outline: 0;
  background: #f2f2f2;
  width: 100%;
  border: 0;
  margin: 0 0 15px;
  padding: 15px;
  box-sizing: border-box;
  font-size: 14px;
}
.form button {
  font-family: "Roboto", sans-serif;
  text-transform: uppercase;
  outline: 0;
  background: #FF6229;
  width: 100%;
  border: 0;
  padding: 15px;
  color: #FFFFFF;
  font-size: 14px;
  -webkit-transition: all 0.3 ease;
  transition: all 0.3 ease;
  cursor: pointer;
}
.form button:hover,.form button:active,.form button:focus {
  background: #FF5415;
}
.form .message {
  margin: 15px 0 0;
  color: #b3b3b3;
  font-size: 16px;
}
.form .message a {
  color: #FF7F50;
  text-decoration: none;
}
.form .login-form {
  display: none;
}
.container {
  position: relative;
  z-index: 1;
  max-width: 300px;
  margin: 0 auto;
}
.container:before, .container:after {
  content: "";
  display: block;
  clear: both;
}
.container .info {
  margin: 50px auto;
  text-align: center;
}
.container .info h1 {
  margin: 0 0 15px;
  padding: 0;
  font-size: 36px;
  font-weight: 300;
  color: #1a1a1a;
}
.container .info span {
  color: #4d4d4d;
  font-size: 12px;
}
.container .info span a {
  color: #000000;
  text-decoration: none;
}
.container .info span .fa {
  color: #FF7F50;
}
body {
  background: #FF7F50;     
}

@media only screen and (max-width: 400px) {
  .login-page {
    width: 100%;
    height: 100%;
  }
}

#create-username.error {
  color: red;
}

#create-password.error {
  color: red;
}

#create-email.error {
  color: red;
}
!

JS 

              
                // Look at console
$(document).ready(function() {
	var loginUsername;
	var loginPassword;
	var account = [loginUsername, loginPassword];
  
	$('#login-button').on('click', function() {
		var loginUsernameEntry = $("#login-username").val();
		var loginPasswordEntry = $("#login-password").val();
		if (loginUsernameEntry == account[0] && loginPasswordEntry == account[1]) {
			console.log("Current Username " + account[0]);
			console.log("Current Password " + account[1]);
			console.log("Logged In");
		} else {
			console.log("Attempted Username " + loginUsernameEntry);
			console.log("Attempted Password " + loginPasswordEntry);
			console.log("Login Falied");
		};
	});
  
	$('#create-button').on('click', function() {
		var createUsernameEntry = $("#create-username").val();
		var createPasswordEntry = $("#create-password").val();
		var createEmailEntry = $("#create-email").val();
    var createUsernameValid = false;
    var createPasswordValid = false;
    var createEmailValid = false;
    var createUsernameObject = $("#create-username");
    var createPasswordObject = $("#create-password");
    var createEmailObject = $("#create-email");
    var validate = /^\s*[a-zA-Z0-9,\s]+\s*$/;
    var validateEmail = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
   
    if(!validate.test(createUsernameEntry) || (createUsernameEntry).length == 0) {
      $(createUsernameObject).addClass("error")
      $(createUsernameObject).val("No special characters or spaces.")
    } else {
      createUsernameValid = true;
      var createUsername = $(createUsernameObject).val();
    }
    
    if(!validate.test(createPasswordEntry) || (createPasswordEntry).length == 0) {
      $(createPasswordObject).addClass("error");
      $(createPasswordObject).val("No special characters or spaces.");
    } else {
      createPasswordValid = true;
      var createPassword = $(createPasswordObject).val();
    }
    
    if(!validateEmail.test(createEmailEntry)) {
      $(createEmailObject).addClass("error");
      $(createEmailObject).val("Enter a valid email");
    } else {
      createEmailValid = true;
      console.log("Account Email " + createEmailObject.val())
    }
      
    $(createUsernameObject).on('click', function () {
      $(this).val("");  
      $(this).removeClass("error");
    });
    
    $(createPasswordObject).on('click', function () {
      $(this).val("");  
      $(this).removeClass("error");
    });
    
    $(createEmailObject).on('click', function () {
      $(this).val("");
      $(this).removeClass("error");
    });
    
		account = [createUsername, createPassword];
		console.log("Account Username " + account[0]);
		console.log("Account Password " + account[1]);
    
		if(createUsernameValid == true && createPasswordValid == true && createEmailValid == true) {
      $('form').animate({
			height: "toggle",
			opacity: "toggle"
		}, "fast");
    }
	});
  
	$('.message a').on('click', function() {
		$('form').animate({
			height: "toggle",
			opacity: "toggle"
		}, "fast");
	});
});
!
999px

Console