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.categories-prev {
   display: flex;
   flex-wrap: wrap;
   & > * {
      flex: 1 0 calc(25% - 20px);
      max-width: 255px;
      width: calc(25% - 20px);
      margin-right: 20px;
      margin-bottom: 30px;
      &:nth-child(4n+4) { margin-right: 0; }
   }
}