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