demo.css

body{
  text-align: center;
  background: url("http://dash.ga.co/assets/anna-bg.png");
  background-size: cover;
  background-position: center;
  color: white;
  font-family: helvetica;
}

p{
  font-size: 22px;
}

input{
  border: 0;
}

input[type="submit"]{
  background: red;
  color: white;
}