body {
  padding: 10px;
  background: #e1bee7;
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
}
abbr {
  pointer-events: none;
}
a,
abbr {
  text-decoration: none;
}
a:link,
a:visited {
  color: #12005e;
}
a:active,
a:hover {
  color: #4a148c;
}
h1 {
  color: #12005e;
  text-align: center;
}
#calculator {
  width: 335px;
  margin: 30px auto;
  padding: 20px 20px 1px 20px;
  background: #4a148c;
  border-radius: 1%;
}
#display {
  box-sizing: border-box;
  max-width: 335px;
  margin-bottom: 20px;
  padding: 10px 20px;
  background: #12005e;
  font-size: 4rem;
  text-align: right;
  border-radius: 2%;
}
#keypad {
  display: grid;
  grid-template-columns: 80px 80px 80px 80px;
  grid-gap: 5px;
}
#keypad button {
  padding: 20px 0;
  border: none;
  background: #7c43bd;
  color: #fff;
  font-size: 1.5rem;
  border-radius: 5%;
}
#keypad button:hover {
  background: #7b1fa2;
}
#keypad .is-depressed {
  background: #7b1fa2;
}
p {
  text-align: center;
}
.help {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}