.css

html {
    -webkit-text-size-adjust: 100%;
        -ms-text-size-adjust: 100%;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
::-moz-selection {
    background: #4a4a4a;
    color: #aaa;
}
::selection {
    background: #4a4a4a;
    color: #aaa;
}
/*
FYI: for Edge
https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/suggestions/9081910-add-support-for-scrollbar-styling
*/
::-webkit-scrollbar {
    width: 12px;
}
::-webkit-scrollbar-track {
    background: #fff;
}
::-webkit-scrollbar-thumb {
    background: #2d2d2d;
}
::-webkit-scrollbar-thumb:window-inactive {
    background: #2d2d2d;
}
::-webkit-scrollbar-thumb:vertical:hover {
    background: #2d2d2d;
}