set style

<style lang="scss" scoped>
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
</style>

found that it is only valid for some elements.

all valid after being changed to / deep/

.editor /deep/ {
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
}

Why is this?