body {
    -webkit-touch-callout: none;
    /* iOS Safari */
    -webkit-user-select: none;
    /* Chrome/Safari/Opera */
    -moz-user-select: none;
    /* Firefox */
    -ms-user-select: none;
    /* Internet Explorer/Edge */
    user-select: none;
    /* Non-prefixed version, currently supported by most modern browsers */
}