Hello everyone, tell me how in the boostrap 3 to align these blocks in the center?
<div class="row"> <div class=" col-xs-2 col-md-3"> <div class="card mb-4 box-shadow"> <img src="#" class="img-fluid"> <div class="card-body"> <p class="card-text text-center"><b>text</p> </div> <div class="text-center"> <a class="btn btn-lg text-uppercase u-btn-green cs-font-weight-700 cs-font-size-11 cs-color-white cs-color-white--hover cs-bg-primary--hover cs-brd-none rounded-0 cs-px-20 speaker_button_container" href="#" style="margin-bottom: 5px;">подробнее</a> </div> </div> </div> <div class=" col-xs-2 col-md-3"> <div class="card mb-4 box-shadow"> <img src="#" class="img-fluid"> <div class="card-body"> <p class="card-text text-center"><b>text</p> </div> <div class="text-center"> <a class="btn btn-lg text-uppercase u-btn-green cs-font-weight-700 cs-font-size-11 cs-color-white cs-color-white--hover cs-bg-primary--hover cs-brd-none rounded-0 cs-px-20 speaker_button_container" href="#" style="margin-bottom: 5px;">подробнее</a> </div> </div> </div> <div class=" col-xs-2 col-md-3"> <div class="card mb-4 box-shadow"> <img src="#" class="img-fluid"> <div class="card-body"> <p class="card-text text-center"><b>text</p> </div> <div class="text-center"> <a class="btn btn-lg text-uppercase u-btn-green cs-font-weight-700 cs-font-size-11 cs-color-white cs-color-white--hover cs-bg-primary--hover cs-brd-none rounded-0 cs-px-20 speaker_button_container" href="#" style="margin-bottom: 5px;">подробнее</a> </div> </div> </div> </div> If I have 4 blocks, then everything is cool, they are centered, and if there are 3 blocks, there isn’t how to make boostrap so that they always align in the center?