Deep combinator cleanup

[Anny]

Some new CSS makes use of >>> for parent-led styling of Amount components. It works fine but leads to the compiler emitting this warning:

the >>> and /deep/ combinators have been deprecated. Use :deep() instead.

[Anny]

See: https://vue-loader.vuejs.org/guide/scoped-css.html#deep-selectors

[Anny]

This is completed on develop and will be included in the next release.