为什么bootstrap网格不并排

Question

<div class="container" style="width:1430px; border:black solid 1px">
          <div class="row">
              <div class="col-md-3" style="border:black solid 1px">123</div>
              <div class="col-md-3" style="border:black solid 1px">123</div>
          </div>
      </div>

寻思我格式也没错啊

Answer 1

bootstrap css成功引入没