amis2/scss/layout/_hbox.scss

.#{$ns}Hbox {
  display: table;
  table-layout: fixed;
  border-spacing: 0;
  width: 100%;
  // height: 100%;

  &-col {
    display: table-cell;
    vertical-align: top;
    height: 100%;
    width: 100%;
    float: none;
  }
}

.#{$ns}FormHbox {
  margin-left: calc(var(--gap-md) * -1);
  margin-right: calc(var(--gap-md) * -1);

  > .#{$ns}Hbox > .#{$ns}Hbox-col {
    padding-left: var(--gap-md);
    padding-right: var(--gap-md);
    vertical-align: top;

    > .#{$ns}Form-group {
      margin-left: 0;
      margin-right: 0;
    }

    > .#{$ns}Form-group:last-child {
      margin-bottom: 0;
    }
  }

  &.#{$ns}Hbox--xs {
    margin-left: -5px;
    margin-right: -5px;

    > .#{$ns}Hbox > .#{$ns}Hbox-col {
      padding-left: 5px;
      padding-right: 5px;
    }
  }

  &.#{$ns}Hbox--sm {
    margin-left: -10px;
    margin-right: -10px;

    > .#{$ns}Hbox > .#{$ns}Hbox-col {
      padding-left: 10px;
      padding-right: 10px;
    }
  }
}

@include media-breakpoint-down(md) {
  .#{$ns}Hbox--autoSm {
    display: block;

    & > .#{$ns}Hbox-col {
      width: auto;
      height: auto;
      display: block;

      &.show {
        display: block !important;
      }
    }

    & .#{$ns}Vbox {
      height: auto;
    }

    & .cell-inner {
      position: static !important;
    }
  }
}

@include media-breakpoint-down(sm) {
  .#{$ns}Hbox--autoXs {
    display: block;

    & > .#{$ns}Hbox-col {
      width: auto;
      height: auto;
      display: block;
    }

    & .#{$ns}Vbox {
      height: auto;
    }

    & .cell-inner {
      position: static !important;
    }
  }
}