.header{z-index:1036;position:fixed;top:50px;right:50px}.header .menu{z-index:100;background-color:#fff;border-radius:25px;width:480px;height:650px;position:absolute;overflow:hidden}@media (max-width:768px){.header{position:fixed;top:10px;right:10px}.header .menu{overflow-y:auto}}