body{
    background-color:  gray;
}

  h1{
    color: black;
    text-align: center;
    font-size: xx-large;
  }

  p{
    color:black;
    text-align: center;
    font-size: x-large;
  }  

.pricipal{
    background-image:url(img/pc.jpg);
}
.container{
height: 100vh;
}