*{
    margin:0;
    padding:0;
    font-family: 'popins',sans-serif;
    box-sizing: border-box;
}
.container{
    width:100%;
    height: 100vh;
    background: #e3f9ff;
    display: flex;
    align-items: center;
    justify-content: center;
}
.calculator{
    background: #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;
}