body{
    display: flex;
    justify-content: center;
    align-items: center;
}

#calculator{
    padding-top: 100px;

}

#ans{
    background-color:#85c1d4;
    border: solid black;
    font-size: 44px;
    padding-top: 35px;
    padding-bottom: 0;
    text-align: right;
    width: 318px;
    margin: 0;
    height: 44px;
}

.row{
    display: flex;
}

.button{
    border: solid black;
    width: 75px;
    max-height: 65px;
    font-size: 40px;
    padding-top: 21px;
    padding-bottom: 20px;
    text-align: center;
    background-color:#cdcdcd;
}
#zero{
    width: 156px;
}