.container{
    width:100%;
    height:100vh;
    background-color:hsl(193, 100%, 95%);
    display:flex;
    justify-content: center;
    align-items: center;
}
.calculator{
    background-color: #3a4452;
    padding:20px;
    border-radius:10px;
}
.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{
    width:145px;
}
form input.operator{
    background-color:orangered;
}