JSFiddle - React, Tailwind, and code Playground

HTML

<div class="zentriert">Zentriert :-)</div>

CSS

html {
    height: 100%;
  }

    body {
      font: 200% sans-serif;
      background-color: #dddddd;
	
      display: -webkit-box;
      display: -webkit-flex;
      display: -ms-flexbox;
      display: flex;
      height: 100%;
      margin: 0;	 
       -webkit-box-align: center; 
      -webkit-align-items: center; 
          -ms-flex-align: center; 
              align-items: center;
    }

    .zentriert {
      margin: auto;
      background-color: #227a7d;
      color: rgba(182, 236, 230, 0.93);
      padding: 1em;
      border: 1px solid #236b6e;
      border-radius: 4px;
    }
    .no-flexbox.no-flexboxlegacy .zentriert {   
		max-width: 8em;
	}

JavaScript

/* Modernizr 2.8.3 (Custom Build) | MIT & BSD
 * Build: http://modernizr.com/download/#-flexbox-flexboxlegacy-cssclasses-testprop-testallprops-domprefixes
 */
;window.Modernizr=function(a,b,c){function x(a){j.cssText=a}function y(a,b){return x(prefixes.join(a+";")+(b||""))}function z(a,b){return typeof a===b}function A(a,b){return!!~(""+a).indexOf(b)}function B(a,b){for(var d in a){var e=a[d];if(!A(e,"-")&&j[e]!==c)return b=="pfx"?e:!0}return!1}function C(a,b,d){for(var e in a){var f=b[a[e]];if(f!==c)return d===!1?a[e]:z(f,"function")?f.bind(d||b):f}return!1}function D(a,b,c){var d=a.charAt(0).toUpperCase()+a.slice(1),e=(a+" "+n.join(d+" ")+d).split(" ");return z(b,"string")||z(b,"undefined")?B(e,b):(e=(a+" "+o.join(d+" ")+d).split(" "),C(e,b,c))}var d="2.8.3",e={},f=!0,g=b.documentElement,h="modernizr",i=b.createElement(h),j=i.style,k,l={}.toString,m="Webkit Moz O ms",n=m.split(" "),o=m.toLowerCase().split(" "),p={},q={},r={},s=[],t=s.slice,u,v={}.hasOwnProperty,w;!z(v,"undefined")&&!z(v.call,"undefined")?w=function(a,b){return v.call(a,b)}:w=function(a,b){return b in a&&z(a.constructor.prototype[b],"undefined")},Function.prototype.bind||(Function.prototype.bind=function(b){var c=this;if(typeof c!="function")throw new TypeError;var d=t.call(arguments,1),e=function(){if(this instanceof e){var a=function(){};a.prototype=c.prototype;var f=new a,g=c.apply(f,d.concat(t.call(arguments)));return Object(g)===g?g:f}return c.apply(b,d.concat(t.call(arguments)))};return e}),p.flexbox=function(){return D("flexWrap")},p.flexboxlegacy=function(){return D("boxDirection")};for(var E in p)w(p,E)&&(u=E.toLowerCase(),e[u]=p[E](),s.push((e[u]?"":"no-")+u));return e.addTest=function(a,b){if(typeof a=="object")for(var d in a)w(a,d)&&e.addTest(d,a[d]);else{a=a.toLowerCase();if(e[a]!==c)return e;b=typeof b=="function"?b():b,typeof f!="undefined"&&f&&(g.className+=" "+(b?"":"no-")+a),e[a]=b}return...