body {
  margin: 30px;
  color: rgb(255, 255, 255);
  background-color: chartreuse;
}

p {
  background-color: black;
}

p.blue-background {
  background-color: blue;
}

p#red-background {
  background-color: red;
}

p[title="Зелений параграф"] {
  background-color: green;
}

div p {
  background-color: aqua;
}

div > article {
  background-color: chocolate;
}

p + section {
  background-color: blueviolet;
}

p ~ aside {
  background-color: crimson;
}

footer#footer-id {
  background-color: blue;
}

footer.footer-class {
  background-color: brown;
}

footer > aside p[title="Параграф"].p-class {
  background-color: cornflowerblue;
}

footer + aside p[title="Параграф"] {
  background-color: deeppink;
}