*,
*::before,
*::after {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  display: grid;
  inline-size: 100vw;
  block-size: 100vh;
  font-size: 12px;
  font-family: Arial, sans-serif;
  background-color: #7357d6da;
}

.container {
  display: grid;
  place-content: center;
  margin: auto;
  grid-template-columns: repeat(4, 4.4rem);
  grid-template-rows: minmax(4.8rem, auto) repeat(7, 4.4rem);
}

.output {
  grid-column: 1 /-1;
  display: flex;
  flex-direction: column;
  background-color: #222;
  color: white;
}

.display {
  display: flex;
  padding: 0.8rem;
  flex-direction: column;
  align-items: flex-end;
  justify-content: space-around;
  word-wrap: break-word;
  word-break: break-all;
}
.previous {
  font-size: 1.2rem;
  color: #fffc;
}

.current {
  font-size: 1.8rem;
}

button {
  background-color: #dfbfbfee;
  border: 1px solid white;
  font-size: 1.5rem;
  outline: none;
}

.sign:hover {
  background-color: red;
  color: white;
}

.number:hover,
.CE:hover,
.C:hover {
  background-color: rgba(255, 255, 255, 0.849);
}

.span-two {
  grid-column: span 2;
}