Blog Header

<style> *[id*='twitter-widget-'] { margin: 25px auto !important; width: 80% !important; } </style>

Blog Footer

<script> window.twttr = (function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0], t = window.twttr || {}; if (d.getElementById(id)) return t; js = d.createElement(s); js.id = id; js.src = "https://platform.twitter.com/widgets.js"; fjs.parentNode.insertBefore(js, fjs); t._e = []; t.ready = function(f) { t._e.push(f); }; return t; }(document, "script", "twitter-wjs")); </script>

(siehe https://dev.twitter.com/web/javascript/loading)