input[type="button"] {
    width: 50px;
    height: 50px;
    font-size: 20px;
    align-items: center;
    text-align: center;
}
.box{
    justify-content: center;
    align-items: center;
    justify-items: center;
}
body{
    background-color: aquamarine;
    color: black;
}