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

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

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

.C_main {
  gap: 1rem;
  padding: 0.5rem;
  background-color: var(--color_4);
}

.C_header {
  justify-content: space-between;
  align-items: center;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color_1);
}
.C_header button {
  font-size: 1.5rem;
  padding: 0 1rem;
}

.C_grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.C_month {
  padding: 1rem 0.5rem;
  text-align: center;
  font-weight: 500;
  border-radius: 0.5rem;
  cursor: pointer;
  background-color: #fff;
  box-shadow: var(--box_shadow);
  color: var(--color_3);
}
.C_month:active {
  background-color: var(--color_5);
}
.C_month_selected {
  background-color: var(--color_1);
  color: var(--color_text_light);
}