Responsive

.izq {
width:47%;
float:left;
/*border-style:solid;*/
}
.der {
width:47%;
float:right;
/*border-style:solid;*/
}
.divstd {
float:none;
clear:both;
}


@media (max-width: 800px) {
.izq {
width:94%;
float:none;
}
.der {
width:94%;
float:none;
}
fieldset {
border-color:transparent;
}
}