body {
    background-image:url("https://discman2000.neocities.org/Images/M%C3%A9dias/IMAG0019.png");
    background-color:green
}

iframe {
   width:50%;
  height: 500px;
  display: block;
  margin: auto;
}

h1 {
  color:red;
 text-align: center;
 margin:40px;
}
  
button{
text-align: center;
margin-top:100px;
}