div {
    -webkit-touch-callout: none !important; /* iOS Safari */
    -webkit-user-select: none !important; /* Safari */
    -khtml-user-select: none !important; /* Konqueror HTML */
    -moz-user-select: none !important; /* Firefox */
    -ms-user-select: none !important; /* Internet Explorer/Edge */
    user-select: none !important; /* Non-prefixed version, currently
                                  supported by Chrome and Opera */
}

.noselect {
    -webkit-touch-callout: none !important; /* iOS Safari */
    -webkit-user-select: none !important; /* Safari */
    -khtml-user-select: none !important; /* Konqueror HTML */
    -moz-user-select: none !important; /* Firefox */
    -ms-user-select: none !important; /* Internet Explorer/Edge */
    user-select: none !important; /* Non-prefixed version, currently
                                  supported by Chrome and Opera */
}