body{
    background-color: orange;
}

@media only screen and (max-width:800px) {
  /* For tablets: */
  .body {
    width: 80%;
    padding: 0;
  }
  .right {
    width: 100%;
  }
}
@media only screen and (max-width:500px) {
  /* For mobile phones: */
  .angled-line {
    width: 100%;
  }
}
@media only screen and (max-width:800px) {
  /* For tablets: */
  .div {
    width: 80%;
    padding: 0;
  }
}
@media only screen and (max-width:800px) {
  /* For tablets: */
  .div.angled.{
    width: 80%;
    padding: 0;
  }
}