html {
  height: 100%;
  width: 100%;
}
body{
  background-color: skyblue;
}
h1, h2, h3, h4, h5, h6 {
  color: darkgreen;
}
button{
  background-color: green;
  color: white;
  font-family:cursive;
  border-radius: 10px;
}