Swal.fire({ ... customClass: { container: '...', popup: '...', title: '...', closeButton: '...', icon: '...', image: '...', htmlContainer: '...' input: '...', inputLabel: '...', validationMessage: '...', actions: '...', confirmButton: '...', denyButton: '...', cancelButton: '...', loader: '...', footer: '...' timerProgressBar: '...' } }) https://stackoverflow.com/questions/59680384/adding-a-clas..