This theme ships some components (as twig macros) that hide the complexity of rendering the same elements over and over again with the correct HTML.
See Tabler documentation at https://preview.tabler.io/docs/alerts.html#important-alerts
{% from '@Tabler/components/callout.html.twig' import callout %}
{{ callout({type: 'success', description: 'Your account has been saved!', icon: 'fas fa-check'}) }}
{{ callout({type: 'primary', description: 'Here is something that you might like to know.', icon: 'fas fa-info'}) }}
{{ callout({type: 'warning', description: 'Sorry! There was a problem with your request.', icon: 'fas fa-exclamation-triangle'}) }}
{{ callout({type: 'danger', description: 'Your account has been deleted and cannot be restored.', icon: 'fas fa-skull'}) }}
Please go back to the Tabler bundle documentation to find out more about using the theme.