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HTML

<!DOCTYPE html>
<html>

<head>
    <meta charset='utf-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <title>Keyboard and Monitor</title>
    <meta name='viewport' content='width=device-width, initial-scale=1'>
    <link rel='stylesheet' type='text/css' media='screen' href='style.css'>
</head>

<body>
    <form class="container" name="system">
        <input type="text" name="input" class="monitor">
        <div class="keyboard" id="keyboard">
            <div class="keys">
                <input type="button" value="Q" name="Q">
                <input type="button" value="W" name="W">
                <input type="button" value="E" name="E">
                <input type="button" value="R" name="R">
                <input type="button" value="T" name="T">
                <input type="button" value="Y" name="Y">
                <input type="button" value="U" name="U">
                <input type="button" value="I" name="I">
                <input type="button" value="O" name="O">
                <input type="button" value="P" name="P">
            </div>
            <div class="keys">
                <input type="button" value="A" name="A">
                <input type="button" value="S" name="S">
                <input type="button" value="D" name="D">
                <input type="button" value="F" name="F">
                <input type="button" value="G" name="G">
                <input type="button" value="H" name="H">
                <input type="button" value="J" name="J">
                <input type="button" value="K" name="K">
                <input type="button" value="L" name="L">
            </div>
            <div class="keys">
                <input type="button" value="Z" name="Z">
                <input type="button" value="X" name="X">
                <input type="button" value="C" name="C">
                <input type="button" value="V" name="V">
                <input type="button" value="B" name="B">
                <input type="button" value="N" name="N">
                <input type="button" value="M" name="M">
                <input type="button" class="backspace" value="Backspace" name="Backspace">
            </div>
            <input type="button" class="spacebar" name="space">
        </div>
    </form>
    <script>
        document.getElementById('keyboard').addEventListener('click',function (e) {
            if(e.target.tagName === 'INPUT' && e.target.type === 'button') {
                if(e.target.classList.contains('backspace')) {
                    system.input.value = system.input.value.slice(0, -1);
                } else if(e.target.classList.contains('spacebar')) {
                    system.input.value += " ";
                } else {
                    system.input.value += e.target.value;
                }
            }
        })
    </script>
</body>

</html>

CSS

* {
    margin: 0;
    padding: 0;
    font-weight: bold;
    outline: none;
    cursor: pointer;
}

body {
    background: #a3b1c6;
    display: flex;
    height: 100vh;
    align-items: center;
    justify-content: center;
}

.container {
    width: 950px;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 800px;
    position: absolute;
}

.monitor {
    height: 300px;
    width: 500px;
    background: #a3b1c6;
    border: 10px solid #a3b1c6;
    position: absolute;
    top: 5vh;
    box-shadow: 8px 8px 15px rgba(0, 0, 0, 0.3), -8px -8px 15px rgba(245, 345, 245, 0.25),
    8px 8px 15px rgba(0, 0, 0, 0.25) inset;
    border-radius: 20px;
    text-align: center;
    font-size: 30px;
}

.keyboard {
    height: 350px;
    width: 850px;
    box-shadow: 5px 5px 15px rgba(107, 188, 238, 0.3), -8px -8px 15px rgba(245, 245, 245, 0.25);
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    border-radius: 20px;
    position: relative;
    top: 22vh;
}

.keyboard input {
    height: 60px;
    width: 60px;
    box-shadow: 3px 3px 15px rgba(6, 106, 121, 0.3), -5px -5px 10px rgba(245, 245, 245, 0.25);
    border: 5px solid #a3b1c6;
    margin: 10px;
    border-radius: 10px;
    background:rgba(6, 120, 149, 0.81);
    font-size: 23px;
}

.keyboard input:focus{
  color: white;
  box-shadow: 5px 5px 15px rgba(110, 191, 235, 0.3), -8px -8px 15px rgba(245, 245, 245, 0.25),
  5px 5px 15px rgba(0, 0, 0, 0.25) inset;
}

.keyboard .spacebar {
    width: 300px;
}

.keyboard .backspace {
    width: 120px;
    font-size: 19px;
}