Template:OOOInfoBoxTabber/styles.css

/* OOO Infobox – Tabber wrapper (full-width, wrapping tabs)
   - Default width matches .ooo-infobox (300px)
   - Right by default; left/none/center overrides
*/

/* Wrapper */
.ooo-infobox-tabwrap {
  float: right;
  clear: right;
  width: 300px;                  /* keep in sync with .ooo-infobox */
  margin: 0 0 1em 1em;
}

/* Alignment overrides (set by module |align=...) */
.ooo-infobox-tabwrap--left   { float:left;  clear:left;  margin:0 1em 1em 0; }
.ooo-infobox-tabwrap--none   { float:none;                margin:0 0 1em 0; }
.ooo-infobox-tabwrap--center { float:none; display:block; margin:0 auto 1em; }

/* TAB STRIP: full-width rows, equal columns per row, wraps as needed */
.ooo-infobox-tabwrap .tabber__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem;
  margin: 0 0 .5rem 0;
  width: 100%;
  box-sizing: border-box;
  border: 0;                     /* hide any theme baseline */
  background-image: none;
}

/* TABS: share row width equally; labels can wrap */
.ooo-infobox-tabwrap .tabber__tab {
  flex: 1 1 0;                   /* equal width within each row */
  min-width: 7ch;                /* avoid tiny pills with many tabs */
  text-align: center;
  white-space: normal;           /* allow wrapping */
  line-height: 1.2;

  font-weight: 700;
  font-size: 90%;
  padding: .2rem .5rem;
  text-decoration: none;

  background: var(--background-color-neutral, #f5f5f5);
  color: var(--color-base, #202122);
  border: 1px solid #a2a9b1;     /* literal to satisfy TemplateStyles */
  border-bottom: none;
  border-radius: 6px 6px 0 0;
}

/* Active tab: sit flush with the panel (no seam) */
.ooo-infobox-tabwrap .tabber__tab--active {
  background: var(--background-color-base, #ffffff);
  color: var(--color-base, #202122);
  margin-bottom: -1px;
}

/* PANELS: flush with the infobox */
.ooo-infobox-tabwrap .tabber__panel {
  padding: 0;
  border: 0;
  background: transparent;
}

/* Mobile: unfloat and full width */
@media (max-width: 640px) {
  .ooo-infobox-tabwrap,
  .ooo-infobox-tabwrap--left,
  .ooo-infobox-tabwrap--none,
  .ooo-infobox-tabwrap--center {
    float: none;
    width: 100%;
    margin: 0 0 1em 0;
  }
}