mist/interface/client/styles/mixins.import.less

.allowSelection {
  -webkit-touch-callout: initial;
  -webkit-user-select: initial;
  -khtml-user-select: initial;
  -moz-user-select: initial;
  -ms-user-select: initial;
  user-select: initial;
}

.disallowSelection {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}