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

* {
  font-family: sans-serif;
  font-weight: 600;
}

.main__grid-container {
  display: grid;
  background-color: black;
  width: 100vw;
  height: 100vh;
  row-gap: 5px;
  -moz-column-gap: 5px;
       column-gap: 5px;
  padding: 1vh;
  grid-template-columns: repeat(4, auto);
  grid-template-rows: repeat(7, auto);
}
.main__grid-container #screen {
  grid-column-start: 1;
  grid-column-end: -1;
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
  background-color: #45625D;
}
.main__grid-container #screen .main__display-history {
  color: #7EC384;
}
.main__grid-container #ac-button {
  grid-column: span 3;
}
.main__grid-container #zero {
  grid-column: span 2;
}

@media screen and (min-width: 768px) {
  .main__grid-container {
    padding-left: 30vh;
    padding-right: 30vh;
  }
}
.main__grid-container .main__num-button {
  background-color: #7EC384;
  box-shadow: 0px 8px 15px rgba(0, 0, 0, 0.1);
}
.main__grid-container .main__num-button--light {
  background-color: #45625D;
}
.main__grid-container .main__operator-button {
  background-color: #3F7856;
}
.main__grid-container .main__operator-button--light {
  background-color: #45625D;
}