.hamburguesa {
  left: 13.5%;
  transition: 250ms;
  -webkit-transition: 250ms;
  -moz-transition: 250ms;
  -o-transition: 250ms;

}
#MainContent.with-left-panel {

    left: 15%;
    width: 80%;
    transition: 250ms;
    -webkit-transition: 250ms;
    -moz-transition: 250ms;
    -o-transition: 250ms;
}
.panel{
    left: 0px;
    transition: 250ms;
    -webkit-transition: 250ms;
    -moz-transition: 250ms;
    -o-transition: 250ms;
}