你会如何编码：SO突出显示按钮轮廓效果

I'm a person that learns best from example. Currently, I'm diving into the field of Web Development after fifteen years of developing desktop apps. I'm still getting used to all the web technologies used for developing modern web sites and everywhere I look, I see cool little UI elements and have no idea how they're implemented. So I thought I'd ask you, the web experts...the wexperts :)I'm a person that learns best from example. Cur