[Vuejs]-How use scoped with sass in vue?

by using content-class it means that "myclass" will get added later to a child-component of v-dialog, it doesn’t exist at the time when it creates the scoped classes. You can only use the scoped classes for classes that are directly set on v-dialog (e.g. <v-dialog persistent class="myclass">). All classes inside components need either be set with a scoped class within that component (which you cannot do without creating a custom version of the child-component of v-dialog), or you need to use non-scoped classes like you already have..