MediaWiki:Common.css

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body { outline: 3px solid red !important; }
/* =========================
   TAB BAR CONTAINER
========================= */
.wt-tabs {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0;
    border-bottom: 2px solid var(--color-base--subtle, #a2a9b1);
    margin-bottom: 1.25em;
    padding: 0;
    align-items: flex-end;
    width: 100%;        /* stretch full width to block floats */
}

/* =========================
   TAB SPANS (wrappers)
========================= */
.wt-tab {
    display: inline-block;
    position: relative;
    margin-bottom: -2px; /* overlap container border-bottom */
}

/* =========================
   TAB LINKS
========================= */
.wt-tab a {
    display: inline-block;
    padding: 0.4em 0.9em;
    text-decoration: none;
    color: var(--color-base, #54595d);
    background: transparent;
    border: 2px solid transparent;
    border-bottom: none;
    border-radius: 4px 4px 0 0;
    line-height: 1.4;
    white-space: nowrap;
    font-size: 0.9em;
    transition: background 0.15s, color 0.15s;
}

/* =========================
   HOVER
========================= */
.wt-tab a:hover {
    background: var(--color-surface-2, rgba(54,108,204,0.07));
    color: var(--color-progressive, #36c);
}

/* =========================
   ACTIVE TAB
   .is-active is set by #ifeq in Template:SubTabs
========================= */
.wt-tab.is-active a {
    font-weight: 600;
    color: var(--color-progressive, #36c);
    background: var(--color-surface-2, rgba(54,108,204,0.10));   /* visible bg */
    border: 2px solid var(--color-base--subtle, #a2a9b1);
    border-bottom-color: transparent;    /* merges with container border */
    border-radius: 4px 4px 0 0;
}