stylesheet.css

p {
  font-size: 15pt;
}

#keyboardinput {
  background-color: yellow;
}

.red {
  color: red;
}

.blue {
  color: blue;
}

body {
  text-align: center;
}

h1 {
  border-bottom: solid 2px black
}

.keyinput {
  font-size: 32px;
  margin: 10px;
}

.virtualinput {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translate(-50%, 0%);
  max-width: 350px;
  width: 100%;
  height: 180px;
  border: solid 1px gray;
}

.virtualinput button {
  font-size: 32px;
}

.result-hidden {
  visibility: hidden;
  font-size: 60px;
  margin: 20px;
}

.result {
  visibility: visible;
  font-size: 60px;
  margin: 20px;
}