/* Impede selecionar qualquer elemento */
* {
    -webkit-user-select: none !important;
    -moz-user-select: none !important;
    -ms-user-select: none !important;
    user-select: none !important;
}

/* Impede arrastar imagens */
img {
    pointer-events: none !important;
}

/* Impede copiar texto pelo highlight */
::selection {
    background: transparent !important;
}

/* Impede highlight em Firefox */
::-moz-selection {
    background: transparent !important;
}