body{
    background-color: indianred;
    text-align: center;
    display: flex;
    justify-content: center;
    margin-top: 15vh;
}
#calculator{
    background-color: #ccc;
    align-self:center;
    padding: 7px;
    border: 3px solid black;
    border-radius: 25px;
    font-size: 25px;
}
[type="button"] {
    height: 55px;
    width: 55px;
}