html, body{
    display: flex;
    justify-content: center;
    flex-flow: column;
    align-items: center;
}

div{
    display: flex;
    flex-flow: column;
    text-align: center;
}

div > *{
    margin-top: 10px;
}

button{
    background-color: rgb(138, 230, 0);
    border: 1px solid rgb(85, 141, 0);
    padding: 5px;
    border-radius: 5px;
}