body {
    background-image: url("background.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;

}
  
h1 {
    color: black;
    font-size: 500%;
}
h2 {
    color: black;
    font-size: 300%;
}
h3 {
    color: black;
    font-size: 200%;
}


.main {
   margin: auto;
   display: flex;
   justify-content: center;
}
.second {
    margin: auto;
    display: flex;
    justify-content: center;
 }

 .third {
    margin: auto;
    display: flex;
    justify-content: center;
 }