Add the class row-center
to line and col-center
to col-md-3 like this:
<div class="row row-center">
<div ng-repeat="tile in tiles" class="col-md-3 col-center"></div>
</div>
.row-center {
text-align:center;
}
.col-center {
display:inline-block;
float:none;
}
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