<div class="my-container" id="container-id">
  <p class="my-text" id="text-id">Some text</p>
</div>

.my-container .my-text {
  color: red;
}

#container-id #text-id {
  color: orange;
}

div #text-id {
  color: green;
}

#text-id {
  color: blue;
}

p {
  color: purple;
}