How to align the button in center

[Moppo3]

[saimon]

See this post for the same question:

Vertically center a button

I realize this post is a bit old, but I was just looking at this and in order to keep the items stretched to be with a 100% width. Here is an alternative: .center-content > * { -webkit-box-ordinal-group: 1; -moz-box-ordinal-group: 1; -webkit-order: 0; -ms-flex-order: 0; order: 0; -webkit-box-flex: 0; -moz-box-flex: 0; -webkit-flex: 0 1 auto; -ms-flex: 0 1 auto; flex: 0 1 auto; -webkit-align-self: stretch; -ms-flex-item-align: stretch; align-s…