* {
  margin: 0;
  padding: 0;
}
.container {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.calculator {
  background-color: rgb(63, 63, 63);
  padding: 20px;
}
.display {
  display: flex;
  justify-content: flex-end;
  margin: 20px 0;
}

.calculator form input {
  border: 0;
  outline: 0;
  width: 60px;
  height: 60px;
  border-radius: 10px;
  margin: 10px;
  background-color: transparent;
  font-size: 20px;
  cursor: pointer;
  box-shadow: -8px -8px 15px rgba(255, 255, 255, 0.1),
    5px 5px 15px rgba(0, 0, 0, 0.1);
  color: white;
}
.calculator form #equalbtn {
  width: 142px;
}
form .display input {
  flex: 1;
  text-align: right;
  padding-right: 10px;
  box-shadow: none;
  font-size: 50px;
}

@media (max-width:375px) {

  .calculator form input {
    width: 40px;
    height: 40px;
    margin: 6px;
    font-size: 15px;
  }
  .calculator form #equalbtn {
    width: 100px;
  }
  form .display input {
    box-shadow: none;
    font-size: 40px;
  }

}