[CSS] No selectable effect

    .noselect {
        -webkit-touch-callout: none; /* iOS Safari */
        -webkit-user-select: none;   /* Chrome/Safari/Opera */
        -khtml-user-select: none;    /* Konqueror */
        -moz-user-select: none;      /* Firefox */
        -ms-user-select: none;       /* Internet Explorer/Edge */
        user-select: none;           /* Non-prefixed version, currently
                                  not supported by any browser */
    }