// tapcolor
.setTapColor(@c:rgba(0,0,0,0)) {
    -webkit-tap-highlight-color: @c;
}

//user action
.no_select() {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}