<!DOCTYPE html>
<html lang="English">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Create -calculator by Sujon</title>
    <link rel="preconnect" href="https://fonts.gstatic.com">
    <link href="https://fonts.googleapis.com/css2?family=Pathway+Gothic+One&display=swap" rel="stylesheet">  
    <link rel="preconnect" href="https://fonts.gstatic.com">
    <link href="https://fonts.googleapis.com/css2?family=Italianno&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="style.css">

    <style>
           *{
    margin: 0;
    padding: 0;
}
body{
    background-color: black;
}
.container{
    width: 251px;
    height: 400px;
    margin: 80px auto;
    background: #cfd0d5;
    border-radius: 10px 10px 10px 10px;
}
.cell-box{
    width: 200px;
    margin: 20px auto;
    position: relative;
}
.signature {
    font-family: 'Italianno', cursive;
    font-size: 20px;
    position: absolute;
    bottom: -32px;
    right: 0px;
    color: rgb(71, 67, 67);
}
#display{
    height: 40px;
    width: 190px;
    font-size: 38px;
    font-family: 'Pathway Gothic One', sans-serif;
    border: none;
    outline: none;
    color: black;
    text-align: right;
    padding: 5px;
    margin: 37px 0 20px -12px;
    background: #D7E1E3;
    border: 11px solid #5B6066;
    border-radius: 6px;
}   
.button{
    margin: 15px 0 0 5px;
    width: 42px;
    height: 42px;
    border: none;
    outline: none;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    border-radius: 8px;
    background: rgb(214 212 212);
    box-shadow: 5px 5px 10px #DDD, -4px -4px 7px #3a3a3a;
    display: inline-block;
}
.button-black{
    background: rgb(71, 67, 67) !important;
    color: white !important;
    font-size: 20px;
}
.button-red{
    background: rgb(200, 25, 25) !important;
    color: white !important;
    font-size: 20px;
}

.button:active{
    background: #6876bb !important;
    color: white;
}


    </style>
</head>
<body>
  <div class="container">
      <div class="row">
          <div class="cell-box">
              <form name="calculator">
                  <span class="signature">Developer samiun</span>
                  <input id="display" type="text" name="display" placeholder="0" readonly>
                  <br>
                  <input class="button" type="button" value="7" onclick="calculator.display.value +='7'">
                  <input class="button" type="button" value="8" onclick="calculator.display.value +='8'">
                  <input class="button" type="button" value="9" onclick="calculator.display.value +='9'">
                  <input class="button-black button mathbutton" type="button" value="+" onclick="calculator.display.value +='+'">
                  <br>
                  <input class="button" type="button" value="4" onclick="calculator.display.value +='4'">
                  <input class="button" type="button" value="5" onclick="calculator.display.value +='5'">
                  <input class="button" type="button" value="6" onclick="calculator.display.value +='6'">
                  <input class="button-black button mathbutton" type="button" value="-" onclick="calculator.display.value +='-'">
                  <br>
                  <input class="button" type="button" value="1" onclick="calculator.display.value +='1'">
                  <input class="button" type="button" value="2" onclick="calculator.display.value +='2'">
                  <input class="button" type="button" value="3" onclick="calculator.display.value +='3'">
                  <input class="button-black button mathbutton" type="button" value="×" onclick="calculator.display.value +='*'">
                  <br>
                  <input class="button-red button clearbutton" type="button" value="c" onclick="calculator.display.value =''">
                  <input class="button" type="button" value="0" onclick="calculator.display.value +='0'">
                  <input class="button-black button mathbutton" type="button" value="=" onclick="calculator.display.value =eval(calculator.display.value)">
                  <input class="button-black button mathbutton" type="button" value="÷" onclick="calculator.display.value +='/'">
              </form> 
           </div>
       </div>
    </div>  
</body>
</html>

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.