.calculator{
    justify-content: center;
    align-items: center;
    margin-left: 500px;
    display: block;
}
.btn{
    width: 100px;
    height: 80px;
    justify-content: center;
    color: antiquewhite;
    background-color: black;
    border-radius: 20px;
    font-size: 30px; 
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    font-weight: bolder;   
}
.btnC{
    width: 90px;
    height: 100px;
    justify-content: center;
    color: antiquewhite;
    background-color: black;
    border-radius: 20px;
    font-size: 30px; 
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    font-weight: bolder; 
}
.buttonss{
    width: 800px;
}

.inp_screen{
    font-size: 40px;
    font-weight: bold;
    width: 300px;
    height: 90px;
    justify-content: center;
    background-color: whitesmoke;
}