.jsmenu {
   position: fixed;
   top: 0;
   left: 0;
   right: 0;
   bottom: 0;
   z-index: 100;
}

.jsmenu-overlay {
   position: fixed;
   cursor: pointer;
   top: 0;
   left: 0;
   right: 0;
   bottom: 0;
}