.card{
    width: 288px;
    height: auto;
  }
  
  .card__imgframe{
    width: 100%;
    height: auto;
    padding-top: 56.25%;
    background: url(https://placehold.jp/640x360.png) no-repeat center;
    background-size: cover;
    box-sizing: border-box;
  }
  
  .card__textbox{
    width: 100%;
    height: auto;
    padding: 20px 18px;
    background: #ffffff;
    box-sizing: border-box;
  }
  
  .card__textbox > * + *{
    margin-top: 10px;
  }
  
  .card__titletext{
    font-size: 20px;
    font-weight: bold;
    line-height: 125%;
  }
  
  .card__overviewtext{
    font-size: 12px;
    line-height: 150%;
  }