.flex_row, .C_header_holder, .C_header {
  display: flex;
  flex-flow: row nowrap;
}

.flex_col, .C_content, .C_main {
  display: flex;
  flex-flow: column nowrap;
}

.fill, .C_main {
  width: 100%;
  height: 100%;
}

.C_main {
  width: 100dvw;
  align-items: center;
  justify-content: stretch;
  overflow: hidden;
}

.C_header {
  width: 100%;
  align-items: center;
  box-shadow: 0rem 0.5rem 1rem 0rem var(--color_shadow);
  z-index: 2;
}
.C_header_holder {
  width: 100rem;
  padding: 0 1rem 0 1rem;
  justify-content: space-between;
  align-items: center;
}
@media only screen and (orientation: portrait) {
  .C_header_holder {
    justify-content: space-around;
    width: 100%;
  }
}

.C_options {
  width: 100%;
}
@media only screen and (orientation: portrait) {
  .C_options {
    display: none;
  }
}

.C_content {
  width: 100%;
  flex: 1;
  overflow: hidden;
  padding: 1rem;
}
@media only screen and (orientation: portrait) {
  .C_content {
    padding: 0rem;
  }
}