/* a {
  color: #ffffff;
} */

body {
  padding: 0;
  margin: 0;
  min-width: 70%;
  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
}

.tk{
  width: 40%;
  margin: 0 auto;
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 20px 0;
}

.input-group-lg{
  flex: 1;
}

.video_play{
  min-width: 0;
  flex: 1 1 auto;
  position: relative;
}

.card {
  position: relative;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  min-width: 0;
  word-wrap: break-word;
  background-color: #fff;
  background-clip: border-box;
  border: 1px solid rgba(0,0,0,.125);
  border-radius: 1rem
}

.card-body {
  -webkit-box-flex: 1;
  -ms-flex: 1 1 auto;
  flex: 1 1 auto;
  padding: 1.25rem
}

.card-header:first-child {
  border-radius: calc(.25rem - 1px) calc(.25rem - 1px) 0 0
}

.card-header+.list-group .list-group-item:first-child {
  border-top: 0
}

img {
  height: auto;
  width: 100%;
}