body {

font-family: Arial;

background: black;

color: white;

text-align: center;

}

a {

display: block;

margin: 20px;

padding: 15px;

background: blue;

color: white;

text-decoration: none;

width: 200px;

margin-left: auto;
margin-right: auto;

border-radius: 10px;

}

iframe {

margin-top: 20px;

border-radius: 10px;

}