html,body{
    width:100%;
    height:100%;
    margin:0;
}

p{
    width:100%;
    height:100%;
    margin:0;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;;
}

@media only screen and (max-width: 800px) {
    p{
        /* background-size:70%; */
    }
  }