body {
  background-color: rgb(29, 29, 29);
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
}



#display {
  width: 100%;
  height: 25vh;
  padding: 20px;
  background-color: rgb(59, 59, 59);
  color: rgb(255, 255, 255);
  border: none;
  font-size: 48px;
  display: flex;
  justify-content: flex-end;
  align-items: flex-end;
  padding: 24px;
  box-sizing: border-box;
}

table {
  width: 100%;
  height: 70vh;
}

td {
  width: 25%;
  border-radius: 0px;
  border: none;
  background-color: rgb(0, 0, 0);
  color: rgb(255, 255, 255);
  font-size: 24px;
  font-weight: bold;
  cursor: pointer;
  text-align: center;
  transition: 250ms ease-in-out;
}

td:hover {
  background-color: rgb(40, 40, 40);
}
td:active {
  background-color: rgb(82, 82, 82);
}

.operator {
  background-color: rgb(0, 255, 0);
}
.operator:hover {
  background-color: rgb(86, 255, 86);
}
.operator:active {
  background-color: rgb(135, 255, 135);
}

.side-op {
  background-color: rgb(60, 120, 60);
}
.side-op:hover {
  background-color: rgb(80, 120, 80);
}
.side-op:active {
  background-color: rgb(110, 120, 110);
}