The maximum number of Declarations in a single RuleSet should be low. A large number means the RuleSet is hard to scan and finding the correct Declaration may be troublesome.

Example of a RuleSet having a lot of Declarations:

.my-selector {
  display: none;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  position: absolute;
  width: 100%;
  min-width: 768px;
  height: 569px;
  margin: -1px 0 0 0;
  z-index: 1;
  background-color: #000;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  padding: 30px;
}