@import url('https://fonts.googleapis.com/css2?family=Teko&display=swap');

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: 'Teko', sans-serif;
}

body {
  background: black;
}

.calculator {
  display: grid;
  grid-template-rows: 2fr 4fr;
  grid-auto-columns: 1fr;
  grid-auto-rows: 1fr;
  gap: 0px 0px;
  grid-auto-flow: row;
  justify-items: stretch;

  height: 100vh;
  width: 100vw;
}

.display {
  display: grid;
  grid-template-rows: 1fr 1fr;
  grid-auto-columns: 1fr;
  gap: 0px 0px;
  grid-auto-flow: row;
  grid-area: 1 / 1 / 2 / 2;

  background: lightgrey;
  text-align: right;
  padding: 10px;
  word-wrap: break-word;
  word-break: break-all;
}

.previous {
  grid-area: 1 / 1 / 2 / 2;
  font-size: 1.5rem;
}

.current {
  grid-area: 2 / 1 / 3 / 2;
  font-size: 2.5rem;
}

.buttons {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr 1fr 1fr;
  gap: 0px 0px;
  grid-auto-flow: row;
  grid-template-areas:
    "seven eight nine divide DEL"
    "four five six times CLR"
    "one two three minus equal"
    "zero zero decimal plus equal";
  grid-area: 2 / 1 / 3 / 2;
}

.zero {
  grid-area: zero;
}

.one {
  grid-area: one;
}

.two {
  grid-area: two;
}

.three {
  grid-area: three;
}

.four {
  grid-area: four;
}

.five {
  grid-area: five;
}

.six {
  grid-area: six;
}

.seven {
  grid-area: seven;
}

.eight {
  grid-area: eight;
}

.nine {
  grid-area: nine;
}

.decimal {
  grid-area: decimal;
}

.plus {
  grid-area: plus;
}

.minus {
  grid-area: minus;
}

.times {
  grid-area: times;
}

.divide {
  grid-area: divide;
}

.equal {
  grid-area: equal;
}

.CLR {
  grid-area: CLR;
}

.DEL {
  grid-area: DEL;
}

button {
  cursor: pointer;
  font-size: 2rem;
  border: 1px solid white;
  outline: none;
}

button:hover {
  background: lightgrey;
}

@media(min-width: 768px) {
  .calculator {
    height: 30rem;
    width: 30rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
}