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.youtube_flex{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-content: center;
    justify-content: center;
    align-items: stretch;
    margin: 1em auto 2em;
}
.youtube_box{
    width: 23%;
    margin: 1%;
    background: #fff;
    padding: 1%;
    text-align: center;
}
.youtube {
    width: 100%;
    aspect-ratio: 16 / 9;
  }
  .youtube iframe {
    width: 100%;
    height: 100%;
  }
  @media screen and (max-width: 767px) {
    .youtube_box{
        width: 45%;
    }
  }