Social Sharing Button

HTML + CSS (SCSS) + JavaScript

http://codepen.io/RSH87/pen/MymoNO
Download

CSS Buttons

HTML (Jade) + CSS (SCSS)
http://codepen.io/derekmorash/pen/XddZJY
Download

Material Download Button

HTML + CSS (SCSS) + JavaScript (Babel)
http://codepen.io/montechristos/pen/GZgXWN
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Loader Button

HTML + CSS (SCSS)
http://codepen.io/roydigerhund/pen/zqxoE
Download

Stay In Touch/Share Button

HTML + CSS + JavaScript/jQuery
http://codepen.io/fralec/pen/xZBKzO
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Button Simple Hover Effect

HTML + CSS (SCSS)
http://codepen.io/ryok_codepen/pen/vLoRVg
Download

CSS3 Buttons Inspired By Active Theory

HTML + CSS (SCSS)
CSS3 buttons inspired by http://activetheory.net/
http://codepen.io/ihatetomatoes/pen/bEZVvG
Download

 

User Profile Button

HTML + CSS (SCSS)
http://codepen.io/foolproof/pen/eJogvp

 

Social Sharing Button Animation

HTML + CSS (LESS)
SVG stroke animation on hover.
http://codepen.io/wouwi/pen/Lwrmi

 

Social Sharing Buttons

HTML + CSS
http://codepen.io/codewunder/pen/wCmLl