set width default for card and center play button

changes/changelog.d/530.bugfix

+Set sane width default for ui cards and center play button (#530)

front/src/components/audio/album/Widget.vue

@@ -120,9 +120,9 @@ export default {
   width: 100%;
 }
 .ui.cards {
-  justify-content: center;
+  justify-content: flex-start;
 }
-.ui.cards > .card {
+.ui.five.cards > .card {
   width: 15em;
 }
 .with-overlay {
@@ -135,3 +135,8 @@ export default {
   align-items: center !important;
 }
 </style>
+<style>
+.ui.cards .ui.button {
+  margin-right: 0px;
+}
+</style>