code should be
.ipsWidget_inner .threadStarterSizeNormal, .ipsWidget_inner .threadStarterSizeSmall {
margin-left: auto;
margin-right: auto;
}
.ipsWidget_inner .threadStarterSizeNormal > *, .ipsWidget_inner .threadStarterSizeSmall > * {
margin-left: 5px;
margin-right: 5px;
max-width: 180px;
}
and works fine on sidebar widget and in topic view