.card {
  background-color: #f3f3f3;
  margin: 5px;
  padding: 60px;
  padding-top: 60px;
  padding-bottom: 60px;
  /* take up the full hight of the column*/
  /* min-height: 100%; */
  min-height: 56rem;
  min-width: 40rem;
  max-width: 40rem;
  display: block;
  margin-left: auto;
  margin-right: auto;
}


.sec {
  margin-top: 80px;
  margin-bottom: 80px;
}

.embed-container {
  position: relative;
  padding-bottom: 56.25%; /* ratio 16x9 */
  height: 0;
  overflow: hidden;
  width: 100%;
  height: auto;
}
.embed-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
/* ratio 4x3 */
.embed-container.ratio4x3 {
  padding-bottom: 75%;
}

a {
  text-decoration: underline;
}

footer {
  padding-top: 80px;
}