demo/src/app/components/+tooltip/demos/styling-global/styling-global.html
<style>
.tooltip {
background-color: #7B1FA2;
color: #fff;
}
.tooltip>.arrow:after {
border-top-color: #7B1FA2 !important;
}
</style>
<button type="button" class="btn btn-success"
tooltip="Vivamus sagittis lacus vel augue laoreet rutrum faucibus.">
I was globally styled
</button>