Bootstrap Modal 弹框页面垂直居中

<div aria-hidden=“true” aria-labelledby=“myModalLabel” role=“dialog” class=“modal fade” ng-model=“test” id=“myModal” style=“display: none;left: 50%;
top: 50%;transform: translate(-50%,-50%);min-width:50%;overflow: visible;bottom: inherit; right: inherit;”></div>

<button class=“btn btn-sm blue btn-outline” data-target="#myModal" data-toggle=“modal” >弹框</button>