CSS declarator order


.selector {
  /* Positioning */
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 10;

  /* Box Model */
  display: inline-block;
  float: right;
  overflow: hidden;
  box-sizing: border-box;
  width: 100px;
  height: 100px;
  padding: 10px;
  margin: 10px;

  /* Text */
  font-family: comic-sans;
  font-size: 1em;
  text-align: right;

  /* Visual */
  background: #000;
  color: #fff;
  border: 10px solid #333;
  border-radius: 5px;

  /* Other */
  cursor: pointer;
  opacity: 1;
}

Sources: Nicolas Gallagher's Idiomatic CSS and CSS Tricks.