header {
    text-align: center;
    font-size: 20px;
}

button {
    margin: auto;
    display: block;
    outline: none;
    background-color: #89cff0;
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 10px;
}

#box{
    margin: 0px auto;
    position: relative;
}

._0{
    text-align: center;
    position: absolute;
}