.container {
  margin: 0 auto;
  max-width: 960px;
}

.row {
  display: flex;
}

.row-center {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.flex-top {
  align-self: flex-start;
}

.flex-bottom {
  align-self: flex-end;
}

.item {
  flex: 1;
}

@for $i from 2 to 12 by 1 {
  .item-$i {
    flex: $i;
  }
}

@for $i from 100 to 1250 by 50 {
  .item-$i {
    flex: 1;
    max-width: $(i)px;
  }
}