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CSS

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HTML 

              
                <html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <style>
     *{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    background-color: rgb(26, 26, 26);
    font-family: sans-serif;
  }
#ip{
    width: 500px;
    min-height: 30px;
    box-shadow: -3px -3px 5px rgb(63, 63, 63) , 3px 3px 5px black;
    text-align: center;
    color: white;
    letter-spacing: 1px;
    position: absolute;
    top: 165px;
    left: 50%;
    margin: -50px auto;
    transform:translateX(-50%) ;
    font-size: 18px;
    text-transform: capitalize;
}
.keybord{
    box-shadow: -3px -3px 5px rgb(63, 63, 63) , 3px 3px 5px black;
    width: 680px;
    margin:200px auto 50px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding:20px 20px;
    border-radius: 10px;
}
.row{
    margin:5px ;
    user-select: none;
}
 button{
    width: 50px;
    height: 50px;
    font-weight: bold;
    margin: 0 4px;
    border: none;
    background-color: transparent;
    color:white;
    box-shadow: -2px -2px 4px rgb(63, 63, 63) , 2px 2px 4px black;
    border-radius: 5px;
    cursor: pointer;
}
.row4 , .backspace , .space{
    display: flex;
    align-items: center;
    justify-content: center;
}

.keybord .backspace , .space{
    color: white;
    font-weight: bold;
    cursor: pointer;
    /* user-select: none; */
}
.backspace , .space{
    border-radius: 5px;
    box-shadow: -2px -2px 4px rgb(63, 63, 63) , 2px 2px 4px black;
}
.keybord .space{
    width: 300px;
    height: 50px;
    
}
.keybord .backspace {
    width: 100px;
    height: 50px;
    margin-left: 15px;
    
}
.keybord .active{
    box-shadow:inset -2px -2px 4px rgb(63, 63, 63) ,inset 2px 2px 4px black;
    color: yellow;
}
   </style>
    <title>Document</title>
</head>
<body>
    <p id="ip"></p>
    <div class="keybord">
        <div class="row row1">
            <button>Q</button>
            <button>W</button>
            <button>E</button>
            <button>R</button>
            <button>T</button>
            <button>Y</button>
            <button>U</button>
            <button>I</button>
            <button>O</button>
            <button>P</button>
        </div>
        <div class="row row2">
            <button>A</button>
            <button>S</button>
            <button>D</button>
            <button>F</button>
            <button>G</button>
            <button>H</button>
            <button>J</button>
            <button>K</button>
            <button>L</button>
        </div>
            <div class="row row3">
                <button>Z</button>
                <button>X</button>
                <button>C</button>
                <button>V</button>
                <button>B</button>
                <button>N</button>
                <button>M</button>
            </div>
            <div class="row row4">
                <div class="space" id="space">space</div>
                <div class="backspace" id="backspace">Backspace</div>
            </div>
    </div>
    <script>
      let button = document.getElementsByTagName('button')
let p = document.getElementById('ip');
let space =document.getElementById('space')
let Backspace = document.getElementById('backspace')
// FOR KEYBOARDS
document.body.addEventListener('keydown' , function(index){

    for (let i=0 ; i <button.length ; i++) {
        if(button[i].innerHTML==index.key.toUpperCase()){
            button[i].classList.add('active')
        };
        
    }
    p.innerHTML+=index.key
    if(index.key=='Backspace'){
        p.innerHTML=p.innerHTML.slice(0 , -10)
    }
})
document.body.addEventListener('keyup' , function(index){
    for(let j=0 ; j<button.length ; j++){
        if(button[j].innerHTML == index.key.toUpperCase()){
            button[j].classList.remove('active')
        }
    }
})
// FOR MOUSE
for(let x of button){
    x.addEventListener('mousedown' , function(){
        x.className='active'
        p.innerHTML+=x.innerHTML
    })
}
for(let y of button){
    y.addEventListener('mouseup' , function(){
        y.className=''
    })  
}

space.addEventListener('mousedown',function(){
    space.classList.add('active')
    p.innerHTML+=" "
})
space.addEventListener('mouseup',function(){
    space.classList.remove('active')
})

function back(){
    Backspace.className+=' active'
    p.innerHTML=p.innerHTML.slice(0 , -1)
}
Backspace.onmousedown=back

Backspace.onmouseup=function(){
    Backspace.classList.remove('active')
}
// FOR MOBILES AND TABLET
for(let x of button){
    x.addEventListener('touchstart' , function(){
        x.className='active'

    })
}
for(let y of button){
    y.addEventListener('touchend' , function(){
        space.classList.remove('active')
    })  
}
space.addEventListener('touchstart',function(){
    space.classList.add('active')

})
space.addEventListener('touchend',function(){
    space.classList.remove('active')
})
Backspace.addEventListener('touchstart',function(){
    Backspace.className+=' active'

})
Backspace.addEventListener('touchend',function(){
    Backspace.classList.remove('active')
})
    </script>
</body>
</html>
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