article {
    width:90%;
    margin-left:auto;
    margin-right:auto;
    border:3px solid #583f2f;
    border-radius:10px;
    background-color:#ffffff;
    
    
}



.example {
    color:#8a664f;
    font-weight:bolder;
}

iframe {
    display:block;
    margin:auto;
}

h1 {
    text-align:center;
}