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

.container {
  width: 100%;
  height: 100vh;
  background: #e3f9ff;
  align-items: center;
  justify-content: center;
  display: flex;
}

.calculator {
  background: linear-gradient(145deg, #2e3845, #3a4452);
  padding: 25px;
  border-radius: 20px;
  box-shadow: 8px 8px 20px rgba(0,0,0,0.3), -8px -8px 20px rgba(255,255,255,0.1);
}

.calculator form input{
    border: 0;
    outline: 0;
    width: 60px;
    height: 60px;
    border-radius: 10px;
    box-shadow: -8px -8px 15px rgba(255, 255, 255, 0.1), 5px 5px 15px rgba(0, 0, 0, 0.2);
    background: transparent;
    font-size: 20px;
    color: #fff;
    cursor: pointer;
    margin: 10px;
}

form .display{
    display: flex;
    justify-content: flex-end;
    margin: 20px 0;
}

form .display input{
  text-align:right;
  flex: 1;
  font-size: 45px;
  box-shadow: none;
}

form input.equal{
  background-color: #4fa5bd;
  color: #fff;
  font-weight: bold;
}

form input.operator{
  color:#2eaacc;
}