Among other text and visual aids on a form submission, post-validation, I\'m coloring my input boxes red to signify the interactive area needing attention.
On Chrome
input:focus { outline:none; }
That worked great for me but more than likely to keep things uniform on your site your going to want to also include this in your CSS for textareas:
textarea:focus { outline:none; }
Also it may seem obvious to most but for beginners you can also set it to a color as such:
input:focus { outline:#HEXCOD SOLID 2px ; }