@import url('https://fonts.googleapis.com/css2?family=Montserrat&display=swap');

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: 'Montserrat', sans-serif;
}

body {
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(45deg, #7e91d6, #82c2f792)
}

.calculator {
  border: 1px solid #717377;
  padding: 20px;
  border-radius: 16px;
  background: linear-gradient(45deg, #060122, #2d3b6b);
  box-shadow: -10px -10px 10px rgba(0, 0, 0, 0.7);
}

input {
  width: 310px;
  border: none;
  padding: 30px;
  margin: 10px;
  border-radius: 16px;
  background: #0d0134;
  box-shadow: 0px 3px 15px rgba(84, 84, 84, 0,1);
  font-size: 40px;
  text-align: right;
  color: #fff;
}

.btn {
  width: 60px;
  height: 60px;
  margin: 10px;
  border-radius: 50%;
  background: transparent;
  color: #fff;
  font-size: 21px;
  box-shadow: -3px -3px 15px rgba(255,255, 255,0.1);
  cursor: pointer;
}

.equalBtn {
  background-color: #fb7c14;
  font-size: 30px;
  border: none;
}

.opr {
  background-color: #d4d2d2;
  color: #060122;
  border: none;
  font-size: 30px;
}

input::placeholder {
  color: #fff;
}