/*body header #menu #menu_bar*/
html
{
  	overflow-y: scroll;
}

body:hover .control-slides
{
	transition:opacity 400ms;
	opacity:1;
}
.control-slides
{
    	margin:5px;
    	cursor:pointer;
	transition:opacity 400ms;
	opacity:1;
}
#boton_prev
{
	position:absolute;
    	top:45%;
	left: 50px;
}
#boton_next
{
	position:absolute;
    	top:45%;
	right: 50px;
}