*{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    box-sizing: border-box;
}
body{
    /* background-color: oldlace; */
    background-image: url(bg.jpg);
    background-size: cover;

}
.container{
    width: 100%;    
    height: 100vh;
    /* background-color: rgb(158, 158, 158); */
    display: flex;
    justify-content: center;
    align-items: center;
}
.calculator{
    background-color: #3a4452;
    box-shadow: -8px -8px 15px rgba(255, 255,255, 0.5), 10px 10px 15px rgba(0, 0, 0, 0.5);
    padding: 20px;
    border-radius: 10px;
}
.calculator form input{
    border: 1% solid black;
    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: white;
    margin: 10px;
}
form .inp{
    border: none;
}
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{
    color: aquamarine;
}