Merge pull request #8166 from dominickuo/bug-841972

Bug 841972 - [music] use CSS to position and clip album art on mix page(cherry picked from commit 3d14b28f958f4fe9735bdef5dfde7ba9c8e03f43)
(cherry picked from commit b9f0f11b265f23adabbc1391a53da757e5200e9d)