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

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

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

.C_main {
  cursor: pointer;
  position: relative;
  width: 4rem;
  height: 2rem;
}

.C_checkbox {
  display: none;
}
.C_checkbox:checked + .C_slider {
  background-color: var(--color_2);
}
.C_checkbox:focus + .C_slider {
  box-shadow: 0 0 0 3px var(--color_2);
}
.C_checkbox:checked + .C_slider:before {
  transform: translateX(2rem);
}

.C_slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color_5);
  transition: 0.2s;
  border-radius: 2rem;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}
.C_slider:before {
  position: absolute;
  content: "";
  width: 2rem;
  height: 2rem;
  background-color: var(--color_4);
  transition: 0.2s;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}