JSFiddle - React, Tailwind, and code Playground
by Joe
HTML
<input type="text" id="box" style="width: 100px;" />
JavaScript
$('#box').focus(function()
{
/*to make this flexible, I'm storing the current width in an attribute*/
$(this).attr('data-default', $(this).width());
$(this).animate({ width: 150 }, 'slow');
})