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HTML 

              
                <!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="application-name" content="XSTROKE EE" />
    <meta name="author" name="Emmanuel Onah AfricLite" />
    <meta name="keywords" name="XSTROKE EE,Expert System,Stroke Application,AfricLite Systems,AfricLite,Estonia Stroke Preventor" />
    <title>Sign up| XSTROKE EE</title>
    <!-- Browser Fav icon -->
    <link rel="icon" href="https://i.ibb.co/bsFfPhM/logo.jpg" />
    <!-- Google Fonts -->
    <link href="https://fonts.googleapis.com/css2?family=Roboto&display=swap" rel="stylesheet" />
    <link href="https://fonts.googleapis.com/css2?family=Metal+Mania&display=swap" rel="stylesheet" />
    <!-- Font Awesome -->
    <script src="https://kit.fontawesome.com/054170e3d7.js" crossorigin="anonymous"></script>
    <!-- Styles -->
    <link rel="stylesheet" href="./src/styles/&__general.style.css" />
    <link rel="stylesheet" href="./src/styles/&__header.style.css" />
    <link rel="stylesheet" href="./src/styles/login.style.css" />
    <link rel="stylesheet" href="./src/styles/&__error-404.style.css" />
    <link rel="stylesheet" href="./src/styles/&__error&success.modal.style.css" />
    <link rel="stylesheet" href="./src/styles/signup.style.css" />
  </head>
  <body class="view--body">
    <div class="container signup--container form--container" role="main">
      <a href="./index" aria-describedat="This is an icon button that takes you back to the landing page"><i class="fa fa-home"></i></a>

      <div class="img--form--wrapper">
        <img src="https://i.ibb.co/GTcwdQQ/sign-up-bg.png" alt="" class="login--bg--img" />

        <div class="login--container--row--two form--wrapper">
          <h2 class="logo">🩺XSTROKE EE</h2>
          <h1>Signup</h1>
          <p class="new--to--xstroke">Already have account? <a href="./login">Log in</a></p>
          <form class="signup--form">
            <label for="user_name">Usernamae</label>
            <input type="text" name="user_name" id="userName" placeholder="Username must be atleast 3 char" required />

            <label for="email">Email</label>
            <input type="email" name="email" id="email" placeholder="You email address" required />

            <label for="password">Password</label>
            <input type="password" name="password" id="password" placeholder="Password must alphanumeric (@, _ and - are also allowed) and be 8 - 20 char" required />

            <label for="estonianId">Estonian ID</label>
            <input type="text" name="estonian_id" id="estonianId" placeholder="32922xxxx12" required />
            <input type="submit" value="Signup" id="signup" aria-label="Click to signup" />

            <p class="terms--and--privacy">By continuing you accept our <a href="./terms">Terms of Use</a> and <a href="./privacy-policy">Privacy Policy</a>.</p>
          </form>
        </div>
      </div>
    </div>

    <!-- Noscript tage -->
    <noscript class="noscript">
      <img src="https://i.ibb.co/GvFWHTZ/error-404.png" alt="" />
      <h1>Something's missing</h1>
      <p>
        For full functionality of this site its necessary you enable javascript.
        <a href="https://www.enablejavascript.io/?gclid=CjwKCAjw2Jb7BRBHEiwAXTR4jQ40-Y6EICxN9eW1ZQtde2VXpkAXUvydxTrTr6qRjw22VYudSjubJxoCt4IQAvD_BwE" taregt="_blank">Instructions on how to do that</a>
      </p>
    </noscript>
   
  </body>
</html>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Londrina+Sketch&display=swap");

/* variables */
:root {
  --primary: #fff;
  --secondary: #000;
  --tertiary: #011220;
  --doctorate: #1e90ff;
}


* {
  margin: 0;
  padding: 0;
  line-height: 1.6;
  font-family: "Roboto", sans-serif;
  box-sizing: border-box;
  scroll-behavior: smooth;
}

html {
  font-size: 16px;
}

body {
  scroll-behavior: smooth;
}

.view--body {
  padding: 50px 50px;
  background-image: url(https://i.ibb.co/HKD3GbM/auth-bg.png);
  background-repeat: repeat;
  background-position: center;
}

.container {
  width: 100%;
  margin: 0 auto;
  padding: 10px 20px 20px 20px;
}

h1 {
  font-size: 1.5rem;
}

p {
  font-size: 0.8rem;
}

h3 {
  font-size: 0.9rem;
}

button {
  cursor: pointer;
  width: 170px;
  height: 40px;
  font-size: 0.8rem;
  background: var(--tertiary);
  border: 0;
  color: var(--primary);
  margin-top: 20px;
}

img {
  display: block;
}

li {
  list-style: none;
}

a {
  text-decoration: none;
  cursor: pointer;
}

a:link {
}

a:hover {
}

a:active {
}

a:visited {
}

:disabled {
}

:required {
  outline: none;
  box-shadow: none;
}

:focus {
  outline: none;
}

::placeholder {
  color: #6b6b6b;
}

/* Form Styling */
form {
  display: flex;
  flex-direction: column;
}

form input:not([type="submit"]) {
  background: transparent;
  border: 0;
  border-bottom: solid 1px var(--tertiary);
}

label {
  font-size: 0.8rem;
  padding: 15px 0;
}

button,
input[type="submit"],
input[type="checkbox"] {
  cursor: pointer;
}

.logo {
  font-size: 0.9rem;
  font-family: "Metal Mania", cursive;
}

/* mini ipad screen*/
@media screen and (min-width: 620px) {
}

/* max ipad and mini laptop screen*/
@media screen and (min-width: 960px) {
  html {
    font-size: 18px;
  }
}

/* desktop screen*/
@media screen and (min-width: 960px) {
  html {
    font-size: 20px;
  }

  .heading--h1 {
    color: var(--tertiary);
    font-size: 2.5rem;
    font-family: "Londrina Sketch", cursive;
  }

  #email:focus,
  #password:focus,
  #estonianId:focus,
  #userName:focus,
  #resetEmail:focus,
  .auth--input:focus {
    border: solid 0.5px #333;
    padding: 20px 5px;
    border-left: solid 3px #02335c;
  }
}


/* Mobile */
.noscript {
  width: 100%;
  padding: 10px 30px;
  text-align: center;
  background-color: var(--primary);
  border-radius: 30px;
  box-shadow: 2px 2px 5px 4px #ececec;
  box-sizing: border-box;
}

.noscript img {
  width: 80% !important;
  margin: 0 auto;
}

.noscript h1 {
  font-size: 1.2rem;
}

.form--container {
  background-color: var(--primary);
  width: 100%;
  display: flex;
  flex-direction: column;
  border-radius: 20px;
}

.fa-home {
  color: var(--secondary);
  text-align: right;
}

.login--bg--img {
  max-width: 80%;
  margin: 0 auto;
}

.login--container--row--two h2 {
  font-size: 0.9rem;
  padding: 30px 0;
  color: var(--tertiary);
  font-family: "Metal Mania", cursive;
}

.login--container--row--two h1 {
  padding-bottom: 10px;
}

.new--to--xstroke {
  font-size: 0.8rem;
}

.login--container--row--two a {
  font-size: 0.8rem;
  color: var(--doctorate);
  text-decoration: underline;
}

input[type="submit"] {
  padding: 10px 10px;
  background-color: var(--tertiary);
  color: var(--primary);
  border: 0;
  font-size: 0.9rem;
  margin-top: 20px;
  border-radius: 5px;
}

.or--login--with {
  font-size: 0.9rem;
  padding: 10px 0;
}

.estonian__id {
  font-size: 0.8rem;
  width: 100px;
  background: linear-gradient(to right, var(--doctorate), var(--tertiary));
  border-radius: 50px;
}

.checkbox--wrapper {
  margin-top: 20px;
}

label[for="rememberDevice"] {
  padding: 0 10px;
}

.terms--and--privacy {
  font-size: 0.8rem;
  padding-top: 20px;
}

a[href="../../index.html"] {
  color: var(--secondary);
}

/* mini ipad screen*/
@media screen and (min-width: 768px) {
  .img--form--wrapper {
    padding: 0 60px;
  }
}

/* max ipad and mini laptop screen*/
@media screen and (min-width: 960px) {
  html {
    font-size: 16px;
  }

  .img--form--wrapper {
    padding: 0 100px;
  }
}

/* desktop screen*/
@media screen and (min-width: 1000px) {
  html {
    font-size: 16px;
  }

  .img--form--wrapper {
    width: 100%;
    margin: 0 auto;
    padding: 0 30px;
    display: flex;
  }

  .login--bg--img {
    width: 50%;
    padding: 0;
  }

  .login--container--row--two {
    width: 40%;
    margin: 0 auto;
  }
  .login--container--row--two form {
    width: 100%;
  }
}
!

JS 

              
                ///import utility function for api request here
window.addEventListener("DOMContentLoaded", _ => {
  const form = document.querySelector(".signup--form");
  const RegExp = {
    user_name: /^[a-z]{2,}$/i,
    email: /^([a-z\d\.-]+)@([a-z\d-]+)\.([a-z]{2,8})(\.[a-z]{2,8})?$/,
    password: /^[\w@-]{8,20}$/i,
    estonian_id: /^[\d]{10}$/,
  };

  ///1...form verification
  form.addEventListener("keydown", e => {
    if (RegExp[e.target.name].test(e.target.value)) {
      e.target.style.borderBottomColor = "green";
    } else {
      e.target.style.borderBottomColor = "red";
    }
  });

  ///2...user signup function
  const signupUser = _ => {
    form.addEventListener("submit", e => {
      e.preventDefault();

      const signupData = {
        user_name: form.user_name.value,
        email: form.email.value,
        password: form.password.value,
        estonian_id: form.estonian_id.value,
      };

      ///its your choice to use RegExp to test the value again before send it to backend
      ///Below is simply how to test it again,note i did not borther to test this second validation but i belief it should work for you
      const { user_name, email, password, estonian_id } = signupData;
      if (RegExp.user_name.test(user_name) && RegExp.email.test(email) && RegExp.password.test(password) && RegExp.estonian_id.test(estonian_id)) {
        ///ajax call here to send data to backend or possibly api utility func/method
        /// send the signupData object to the backend
      } else {
        ///Best place to invoke error modal
      }
    });
  };
  signupUser();
});
!
999px

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