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HTML 

              
                <!DOCTYPE html>
<html lang="en">
  <head>
    <title>Calculator</title>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://fonts.googleapis.com/css?family=Oswald|Source+Sans+Pro|Syncopate|Odibee+Sans&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="/style.css">
    <script src="/script.js" defer></script>
  </head>  
  <body>
    <div class="calculator">
      <div class="label">
        <p>
          CSS is fun
        </p>
      </div>
      <div class="output">
        <p>
          by fossheim.io
        </p>
      </div>
      <div class="indent">
        <div class="keypad">
          <p class="key general"><span class="key-content">MC</span></p>
          <p class="key general"><span class="key-content">M+</span></p>
          <p class="key general"><span class="key-content">M-</span></p>
          <p class="key general"><span class="key-content">MR</span></p>
          <p class="key number"><span class="key-content">7</span></p>
          <p class="key number"><span class="key-content">8</span></p>
          <p class="key number"><span class="key-content">9</span></p>
          <p class="key operation"><span class="key-content">—</span></p>
          <p class="key number"><span class="key-content">4</span></p>
          <p class="key number"><span class="key-content">5</span></p>
          <p class="key number"><span class="key-content">6</span></p>
          <p class="key operation"><span class="key-content">÷</span></p>
          <p class="key number"><span class="key-content">1</span></p>
          <p class="key number"><span class="key-content">2</span></p>
          <p class="key number"><span class="key-content">3</span></p>
          <p class="key operation"><span class="key-content"><span class="multiplication">✕</span></span></p>
          <p class="key number"><span class="key-content">0</span></p>
          <p class="key number"><span class="key-content"><span class="decimal">.</span></span></p>
          <p class="key operation"><span class="key-content">=</span></p>
          <p class="key operation"><span class="key-content">+</span></p>
        </div>
      </div>
    </div>
  </body>
</html>
!

CSS 

              
                body {
  background-color: #BAE0D5;
  background-image: linear-gradient(#097F97, #07667C);
  min-height: 100vh;
  min-width: 100vw;
  background-size: 100%;
}


.calculator {
  background-color: #C1C2B0;
  background: linear-gradient(#C4C9C3, #C6C8C7),
    linear-gradient(
      #C6C8C7 25%,
      #484939 27%,
      #87877B 30%,
      #87877B 32%,
      #E7E7DD 33%,
      #C6C8C7 33.5%,
      #C6C8C7 38%,
      #484939 40%,
      #87877B 43%,
      #87877B 45%,
      #E7E7DD 46%,
      #C6C8C7 46.5%,
      #C6C8C7 51%,
      #484939 53%,
      #87877B 56%,
      #87877B 58%,
      #E7E7DD 59%,
      #C6C8C7 59.5%,
      #C6C8C7 64%,
      #484939 66%, 
      #87877B 69%,
      #87877B 71%,
      #E7E7DD 72%,
      #C6C8C7 72.5%,
      #C6C8C7 77%,
      #484939 79%,
      #87877B 82%,
      #87877B 84%,
      #E7E7DD 85%,
      #C6C8C7 85.5%,
      #C6C8C7 90%,
      #484939 92%,
      #87877B 95%,
      #87877B 97%,
      #E7E7DD 98%,
      #C6C8C7 98.5%
    );
  background-size: 100%, 100% 80px;
  background-position: 0 80px, top left;
  background-repeat: no-repeat;
  display: block;
  width: 550px;
  height: 980px;
  margin-left: auto;
  margin-right: auto;
  border-radius: 8px;
  box-sizing: border-box;
  position: relative;
  
  box-shadow: 5px 5px 15px 0px rgba(6,76,92,0.25);
}

.label {
  position: absolute;
  width: 110px;
  height: 35px;
  display: block;
  text-align: center;
  box-sizing: border-box;
  
  top: 32px;
  left: 70px;
  
  background-color: #959FA1;
  background-image: radial-gradient(#8D9FA9, #959FA1);
  border-radius 5px;
  box-shadow: -1px 0.5px 2px rgba(0,0,0,0.1) inset;
  
  font-family: "Oswald", sans-serif;
  text-transform: uppercase;
}

.label p {
  margin-top: 0.3em;
}

.output {
  position: absolute;
  background-color: #0B0301;
  width: 448px;
  height: 190px;
  margin-left: auto;
  margin-right: auto;
  left: 0;
  right: 0;
  top: 130px;
  border-radius: 1px;
  padding: 0 30px;
  box-sizing: border-box;
}

.output p {
  font-family: 'Odibee Sans', cursive;
  text-transform: uppercase;
  letter-spacing: 0.55em;

  color: #9F2530;
  text-align: right;
  font-size: 1.5em;
  text-shadow: 0px 0px 3px rgba(186, 68, 80, 0.9);
  
  position: absolute;
  right: 1em;
  bottom: 1.5em;
}

.indent {
  display: block;
  position: relative;
  top: 350px;
  width: 485px;
  height: 600px;
  margin-left: auto;
  margin-right: auto;
  border-radius: 10px;
  
  background-image: linear-gradient(82deg, rgba(197, 196, 191, 0.75), rgba(109,105,102,0.5));
}

.keypad {
  position: absolute;
  top: 20px;
  display: block;
  width: 454px;
  background-color: black;
  padding: 2px 0 1px 2px;
  border-radius: 3px;
  margin-left: auto;
  margin-right: auto;
  left: 0;
  right: 0;
}

.key {
  cursor: pointer;
  
  display: inline-block;
  width: 110px;
  height: 110px;  
  margin: 0;
  margin-right: -2px;
  margin-left: 1px;
  margin-top: 1px;
  margin-bottom: 2px;
  border-radius: 3px;
}

.key .key-content {
  display: block;
  width: 95px;
  height: 95px;
  text-align: center;
  box-sizing: border-box;
  padding-top: 18px;
  font-family: "Source Sans Pro", sans-serif;
  font-size: 3em;
  border-radius: 33%;
  position: relative;
  top: 7.5px;
  left: 7.5px;
}

.key.number {
  background-color: #333F3B;
  background: linear-gradient(
    90deg,
    #182629,
    #4B5556 80%);
  background-size: 100%;
  background-position: top left;

}

.key.number .key-content {
  background-color: #3E4C4D;
  background: radial-gradient(
    #3E4C4D,
    #38474A,
    #343E3F
  );
  background-size: 150% 350%;
  background-position: center center;
  color: #F5FFFF;
}

.key.operation {
  background-color: #858585;
  background: linear-gradient(
    90deg,
    #858585,
    #F6F1EE 80%);
  background-size: 100%;
  background-position: top left;
}

.key.operation .key-content {
  background-color: #FFFDFC;
  background: radial-gradient(#E4E4E4, #E5DFDF, #F7F5F6);
  background-size: 100% 200%;
  background-position: center center;
  color: #110D0E;
}

.key.operation .key-content .multiplication {
  font-size: 0.7em;
  position: relative;
  top: -0.15em;
}

.key.number .key-content .decimal {
  position: relative;
  top: -0.25em;
}

.key.general {
  background-color: #9F3F0A;
  background: linear-gradient(
    90deg,
    #9F3F0A,
    #CA8430 80%);
  background-size: 100%;
  background-position: top left;
}

.key.general .key-content {
  background-color: #D26402;
  background: radial-gradient(
    #E67333,
    #C5722C,
    #D26402);
  background-size: 200% 300%;
  background-position: center center;
  color: #FFEEE6;
  font-size: 2em;
  padding-top: 30px;
}
!

JS
!
999px

Console