A simple login that I wrote using JavaScript programming language.

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<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Login Using JavaScript</title>

        *,html {
            box-sizing: border-box;
            padding: 0;
            margin: 0;
        main {
            display: flex;
            height: 100vh;
            width: 100vw;
            font-family: sans-serif;
        .col {
            display: block;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            text-align: center;
        .col-1 {
            width: 65%;
            background: url("https://images.pexels.com/photos/807598/pexels-photo-807598.jpeg?cs=srgb&dl=pexels-sohail-nachiti-807598.jpg&fm=jpg&w=1920&h=1440");
            color: #fff;
            position: relative;
        .col-1::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            height: 100%;
            width: 100%;
            background: rgba(10, 44, 46, 0.8);
        .col-2 {
            width: 35%;
            background-color: #fff;
        .author {
            z-index: 1;
        .author hr {
            width: 40px;
            margin: 30px auto;
        .wrapper {
            width: 320px;
        .logo {
            background-color: #154345;
            height: 60px;
            width: 60px;
            border-radius: 50%;
            margin: 0 auto 30px;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 26px;
        h3 {
            font-size: 25px;
            margin-bottom: 10px;
            text-transform: uppercase;
        p {
            margin-bottom: 30px;
            font-size: 14px;
        .block {
            margin-bottom: 15px;
        label {
            display: block;
            margin-bottom: 6px;
            text-align: left;
            width: 100%;
            padding: 10px;
            border: 1px solid #4AA68C;
            outline: none;
            border-radius: 3px;
        button {
            background: #4AA68C;
            color: #fff;
            padding: 10px 20px;
            width: 100%;
            font-size: 15px;
            text-transform: uppercase;
            border-radius: 3px;
            border: 0;
        <div class="col col-1">
            <div class="author">
                <h1>Simple Login Using JavaScript</h1>
                <h2>Jake R. Pomperada, MAED-IT, MIT</h2>
        <div class="col col-2">
            <div class="wrapper">
                <div class="logo">

                <h3>~ Login ~</h3>
                <p>Please enter your username and password below to access your account.</p>

                <form action="" method="post">
                    <div class="block">
                        <label for="">Username</label>
                        <input type="text" id="txtUsername">
                    <div class="block">
                        <label for="">Password</label>
                        <input type="password" id="txtPassword">
                    <button type="submit">Submit</button>

        document.querySelector('form').onsubmit  = (e) => {

            let username  = "123", password  = "123",
                inputUser = document.querySelector('#txtUsername'),
                inputPass = document.querySelector('#txtPassword'),
                form      = document.querySelector("form")

            if (inputUser.value != username || inputPass.value != password) {
                alert("Username and Password do not match. Please try again.")
            if (inputUser.value == username && inputPass.value == password) {
                alert("Success! You're currently logged in now.")