om/node_modules/buefy/src/scss/components/_tabs.scss

.b-tabs {
    .tabs {
        margin-bottom: 0;
        flex-shrink: 0;
        li {
            &.is-disabled {
                pointer-events: none;
                cursor: not-allowed;
                opacity: 0.5;
            }
        }
    }
    .tab-content {
        position: relative;
        overflow: visible;
        display: flex;
        flex-direction: column;
        padding: 1rem;
        .tab-item {
            flex-shrink: 0;
            flex-basis: auto;
        }
        &.is-transitioning {
            overflow: hidden;
        }
    }
    &:not(:last-child) {
        margin-bottom: 1.5rem;
    }
    &.is-fullwidth {
        width: 100%;
    }
}