Colorful theme has two option about customizing colors.It is created for simple flat notifications.
$('#start').on('click',function(){ $.amaran({ 'theme' :'colorful', 'content' :{ bgcolor:'#27ae60', color:'#fff', message:'Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cupiditate, ducimus?' }, 'position' :'bottom right', 'outEffect' :'slideBottom' }); });