body {
  user-select: none;
}

.container {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
  background-color: #212121;
  border-radius: 10px;
  max-width: 450px;
  font-family: 'Calibri';
  padding: 15px;
}

.item {
  color: white;
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 30px;
  cursor: pointer;
  transition: 0.2s;
}

.item:hover {
  background-color: rgb(50, 50, 50);
}

.input_eng {
  padding: 5px 20px;
  min-height: 60px;
  height: auto;
  grid-column: 1/-1;
  font-size: 40px;
  justify-content: flex-end;
  cursor: text;
}

.input_eng:hover {
  background-color: #212121;
}

.upper {
  font-size: 20px;
  margin-left: 3px;
  margin-top: -20px;
}

.clean,
.back,
.percent,
.divide,
.mul,
.sub,
.add {
  color: red;
}

.mem {
  color: orange;
}

.equal {
  background-color: red;
  border-radius: 50%;
  width: 75px;
  height: 75px;
}

.equal:hover {
  background-color: rgb(150, 0, 0);
}