I am working with flexbox to make the grid of a webpage and instead of adding breakpoints I think would be best to select the elements that are alone in a row. For example, using flex-wrap: wrap, select the elements that eventually become alone in a row.
Example of what I was expecting but doesn't exists:
.row {
  display: flex;
  align-items: center;
  justify-items: flex-start;
  flex-wrap: wrap;
}
.row > .column {
   margin: 15px;
   width: auto;
   &:alone-in-row { // HERE 
     width: 100%;
     text-align: center;
   }
}
 
    