threecol_section.css

/*
 * @file
 * Provides the layout styles for three-column layout section.
 */

.layout--threecol-section {
  display: flex;
  flex-wrap: wrap;
}

.layout--threecol-section > .layout__region {
  flex: 0 1 100%;
}

@media screen and (min-width: 40em) {
  .layout--threecol-section--25-50-25 > .layout__region--first,
  .layout--threecol-section--25-50-25 > .layout__region--third,
  .layout--threecol-section--25-25-50 > .layout__region--first,
  .layout--threecol-section--25-25-50 > .layout__region--second,
  .layout--threecol-section--50-25-25 > .layout__region--second,
  .layout--threecol-section--50-25-25 > .layout__region--third {
    flex: 0 1 25%;
  }
  .layout--threecol-section--25-50-25 > .layout__region--second,
  .layout--threecol-section--25-25-50 > .layout__region--third,
  .layout--threecol-section--50-25-25 > .layout__region--first {
    flex: 0 1 50%;
  }
  .layout--threecol-section--33-34-33 > .layout__region--first,
  .layout--threecol-section--33-34-33 > .layout__region--third {
    flex: 0 1 33%;
  }
  .layout--threecol-section--33-34-33 > .layout__region--second {
    flex: 0 1 34%;
  }
}

File

core/themes/stable/layouts/threecol_section/threecol_section.css

/*
 * @file
 * Provides the layout styles for three-column layout section.
 */

.layout--threecol-section {
  display: flex;
  flex-wrap: wrap;
}

.layout--threecol-section > .layout__region {
  flex: 0 1 100%;
}

@media screen and (min-width: 40em) {
  .layout--threecol-section--25-50-25 > .layout__region--first,
  .layout--threecol-section--25-50-25 > .layout__region--third,
  .layout--threecol-section--25-25-50 > .layout__region--first,
  .layout--threecol-section--25-25-50 > .layout__region--second,
  .layout--threecol-section--50-25-25 > .layout__region--second,
  .layout--threecol-section--50-25-25 > .layout__region--third {
    flex: 0 1 25%;
  }
  .layout--threecol-section--25-50-25 > .layout__region--second,
  .layout--threecol-section--25-25-50 > .layout__region--third,
  .layout--threecol-section--50-25-25 > .layout__region--first {
    flex: 0 1 50%;
  }
  .layout--threecol-section--33-34-33 > .layout__region--first,
  .layout--threecol-section--33-34-33 > .layout__region--third {
    flex: 0 1 33%;
  }
  .layout--threecol-section--33-34-33 > .layout__region--second {
    flex: 0 1 34%;
  }
}