body{
 background-image: url('https://www.nhlbi.nih.gov/sites/default/files/inline-images/sleep%20apnea%20-%20shutterstock_1239383362.jpg');   
font-family: Arial, sans-serif;
}

h1 {
    color: darkblue;
   text-align: center;
}

p{
    color: darkgreen;
    font-size: 18px;
}