body {
  margin: 0;
  padding: 0;
  overflow-y: hidden;
}

#heading {
  color: aliceblue;
  text-align: center;
  font-size: 30px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

#back {
  position: fixed;
  top: 19%;
  bottom: 20%;
  width: 70%;
  left: 15%;
  height: 72%
}

.tab {
  font-size: 20px;
}

h1 {
  font-family: 'Courier New', Courier, monospace;
  position: fixed;
  top: 20%;
}

.wrapper {
  height: 450px;
}

#code {
  left: 2%;
}

#number {
  font-size: 12px;
}

.keys-wrapper {
  border: 1px solid rgb(145, 139, 128);
  display: flex;
}

.keys-wrapper button {
  background: rgb(228, 227, 227);
  padding: 10px;
  color: #222;
  border-right: 1px solid rgb(145, 139, 128);
  border-radius: 4px ;
}

.keys-wrapper button:hover {
  background: rgb(189, 189, 189);
}

@media screen and (max-width:992px) {
  .wrapper {
    height: 500px;
  }
}

@media screen and (max-width:767px) {
  .wrapper {
    height: 228px;
  }
}