ar-design/dist/assets/css/components/form/date-picker/calendar/header.css

AR Design is a (react | nextjs) ui library.

.ar-date-calendar > .header {
  display: flex;
  align-items: center;
  min-height: 3.75rem;
  padding: 0 1rem;
  border-bottom: solid 1px var(--gray-200);
}
.ar-date-calendar > .header > .select-field {
  position: relative;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  gap: 0 0.75rem;
  width: 100%;
  padding: 0 0.5rem;
}

.ar-date-calendar > .header > .select-field > .selects {
  display: flex;
  flex-direction: row;
  justify-content: stretch;
  align-items: center;
  gap: 0 1rem;
  height: var(--input-height);
}
.ar-date-calendar > .header > .select-field > .selects > div > span {
  /* -webkit-text-stroke: 1px var(--black); */
  user-select: none;
}

/* #region Prev and Next Buttons */
.ar-date-calendar > .header > .select-field > .prev > span,
.ar-date-calendar > .header > .select-field > .next > span {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: solid 2px transparent;
  transform: rotate(45deg);
  user-select: none;
  cursor: pointer;
}
.ar-date-calendar > .header > .select-field > .prev > span::before,
.ar-date-calendar > .header > .select-field > .next > span::before {
  border: solid 2px transparent;
}

.ar-date-calendar > .header > .select-field > .prev > span:first-child {
  position: relative;
  border-left-color: var(--primary);
  border-bottom-color: var(--primary);
}
.ar-date-calendar > .header > .select-field > .prev > span:first-child::before {
  position: absolute;
  content: "";
  width: 100%;
  height: 100%;
  border-left-color: rgba(var(--primary-rgb), 0.25);
  border-bottom-color: rgba(var(--primary-rgb), 0.25);
}
.ar-date-calendar > .header > .select-field > .prev > span:last-child {
  border-left-color: var(--gray-500);
  border-bottom-color: var(--gray-500);
  margin-left: 0.3rem;
}

.ar-date-calendar > .header > .select-field > .next > span:first-child {
  border-top-color: var(--gray-500);
  border-right-color: var(--gray-500);
  margin-right: 0.3rem;
}
.ar-date-calendar > .header > .select-field > .next > span:last-child {
  position: relative;
  border-top-color: var(--primary);
  border-right-color: var(--primary);
}
.ar-date-calendar > .header > .select-field > .next > span:last-child::before {
  position: absolute;
  content: "";
  width: 100%;
  height: 100%;
  border-top-color: rgba(var(--primary-rgb), 0.25);
  border-right-color: rgba(var(--primary-rgb), 0.25);
}
/* #endregion Prev and Next Buttons */
/* Prev and Next Buttons */