我在父div内有三个div，它们使用以下命令隔开：

display: flex;
justify-content: space-between;

但是，父div上有一个:after，这使三个div不会超出父div的边缘。有没有办法让flexbox忽略:before和:after？

.container {

  width: 100%;

  display: flex;

  justify-content: space-between;

  padding-top: 50px;

  background: gray;

}



.container div {

    background: red;

    height: 245px;

    width: 300px;

  }

.container:before {

    content: '';

    display: table;

  }

.container:after {

    clear: both;

    content: '';

    display: table;

  }


<div class="container">

  <div></div>

  <div></div>

  <div></div>

</div>