.card-group {
  margin-left: auto;
  margin-right: auto;
  width: 90%;
  height: auto;

  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: flex-start;
}

.card-group > :not(:nth-child(3n-2)) {
  margin-left: 0px;
}

.card {
  width: calc((100% - 20px * 2) / 1);
  height: auto;
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
  margin-top: 20px;
}
.card__imgframe {
  width: 100%;
  height: auto;
  height: 224px;
  padding-top: 56.25%;
  box-sizing: border-box;
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center center;
}
.card__textbox {
  width: 100%;
  height: auto;
  padding: 30px;
  box-sizing: border-box;
}
.card__textbox > * + * {
  margin-top: 10px;
}
.card__titletext {
  text-align: left;
  font-weight: bold;
  font-size: 20px;
  color: #e63037;
  letter-spacing: 0.5px;
}
.card__overviewtext {
  text-align: left;
  font-size: 16px;
  color: #222222;
  letter-spacing: 0.5px;
}

@media screen and (min-width: 1100px) {
  .card-group > :not(:nth-child(3n-2)) {
    margin-left: 20px;
  }

  .card {
    width: calc((100% - 20px * 2) / 3);
  }
}