.slideout-menu { position: fixed; top: 0; bottom: 0; width: 256px; min-height: 100vh; overflow-y: scroll; -webkit-overflow-scrolling: touch; z-index: 0; display: none; background-color: #5640a6; } .slideout-menu-left { left: 0; } .slideout-menu-right { right: 0; } .slideout-panel { position: relative; z-index: 1; will-change: transform; background-color: #fff; min-height: 100vh; } .slideout-open, .slideout-open body, .slideout-open .slideout-panel { overflow: hidden; } .slideout-open .slideout-menu { display: block; }