.C_main {
  margin: 0;
  padding: 0;
  border: 0;
  box-sizing: border-box;
  color: inherit;
  scroll-behavior: smooth;
  border-spacing: 0;
  border-collapse: separate;
}

.C_main {
  display: flex;
  flex-flow: row nowrap;
  height: 100%;
  width: 100%;
}
@media only screen and (orientation: portrait) {
  .C_main {
    flex-flow: column-reverse nowrap;
  }
}

.C_list {
  flex-grow: 0;
  flex-shrink: 0;
  position: relative;
  width: 20%;
  overflow-y: auto;
  overflow-x: hidden;
}
@media only screen and (orientation: portrait) {
  .C_list {
    flex-grow: 1;
    width: 100%;
  }
}

.C_list_content {
  position: absolute;
  top: 0;
  left: 0;
}

.C_list_item {
  padding: 3px;
  cursor: pointer;
}

.C_list_item_selected {
  color: black;
  background-color: rgba(255, 255, 255, 0.5);
}

.C_video {
  flex-grow: 1;
}
@media only screen and (orientation: portrait) {
  .C_video {
    height: 50%;
    flex-grow: 0;
  }
}

.C_list_no_content {
  display: flex;
  flex-flow: column nowrap;
}