* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #333;
  position: relative;
}

.calculator {
  position: absolute;
  max-width: 100vw;
  max-height: 100vh;
  top: 50%;
  left: 50%;
  transform: translate(-50%, 20%);
}
.calc {
  margin: 20px auto;
  background-color: #eee;
  width: 400px;
}

input {
  width: -webkit-fill-available;
  height: 35px;
  border: none;
  padding: 10px;
  outline: none;
  font-size: 24px;
}

.press {
  display: grid;
  text-align: center;
}

.press .one {
  /* display: flex;
    align-items: center;
    justify-content: space-around; */
  display: grid;
  grid-template-columns: repeat(4, 100px);
}

.press .one button {
  border: 1px solid;
  width: 100%;
  padding: 10px;
  color: white;
  font-size: 24px;
  font-weight: bold;
  cursor: pointer;
}

.press .one .num {
  background-color: #607d8b;
  opacity: 0.5;
  transition: 0.3s;
}

.cl {
  background-color: darkcyan;
}

.del {
  background-color: red;
}
.equal {
  grid-column: span 2;
  background-color: chartreuse;
}