#demoIzq, #demoDer, #demoMed, #demoizs, #boton { width:100px; text-align:center; margin:0 1px 0 1px; }

#demoDer, #demoMed, #demoizs, #boton { float:right; }

#boton_a { background:#0080C9; border: 1px solid #66BEE5; color:#fff; height: 27px; width: 88px;}

#demo { width:auto;}