Cascade and Specificity

.block img {
  width: 200px;
  height: 200px;
  border-radius: 100px;
}
.special {
  border-radius: 0;
}


.block img {
  width: 200px;
  height: 200px;
  border-radius: 100px;
}
.special {
  border-radius: 0 !important;
}
