style.css

/* DayPicker styles */

.DayPicker {
  display: inline-block;
}

.DayPicker-wrapper {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  position: relative;
  user-select: none;
  flex-direction: row;
  padding: 1rem 0;
}

.DayPicker-Month {
  display: table;
  border-collapse: collapse;
  border-spacing: 0;
  user-select: none;
  margin: 0 1rem;
}

.DayPicker-NavBar {
  position: absolute;
  left: 0;
  right: 0;
  padding: 0 .5rem;
  top: 1rem;
}

.DayPicker-NavButton {
  position: absolute;
  width: 1.5rem;
  height: 1.5rem;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  cursor: pointer;
}

.DayPicker-NavButton--prev {
  left: 1rem;
  background-image: url("data:image/svg+xml;base64,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");
}

.DayPicker-NavButton--next {
  right: 1rem;
  background-image: url("data:image/svg+xml;base64,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");
}

.DayPicker-NavButton--interactionDisabled {
  display: none;
}

.DayPicker-Caption {
  display: table-caption;
  height: 1.5rem;
  text-align: center;
}

.DayPicker-Weekdays {
  display: table-header-group;
}

.DayPicker-WeekdaysRow {
  display: table-row;
}

.DayPicker-Weekday {
  display: table-cell;
  padding: .5rem;
  font-size: .875em;
  text-align: center;
  color: #8b9898;
}

.DayPicker-Body {
  display: table-row-group;
}

.DayPicker-Week {
  display: table-row;
}

.DayPicker-Day {
  display: table-cell;
  padding: .5rem;
  border: 1px solid #eaecec;
  text-align: center;
  cursor: pointer;
  vertical-align: middle;
}

.DayPicker-WeekNumber {
  display: table-cell;
  padding: .5rem;
  text-align: right;
  vertical-align: middle;
  min-width: 1rem;
  font-size: 0.75em;
  cursor: pointer;
  color: #8b9898;
}

.DayPicker--interactionDisabled .DayPicker-Day {
  cursor: default;
}

.DayPicker-Footer {
  display: table-caption;
  caption-side: bottom;
  padding-top: .5rem;
}

.DayPicker-TodayButton {
  border: none;
  background-image: none;
  background-color: transparent;
  box-shadow: none;
  cursor: pointer;
  color: #4A90E2;
  font-size: 0.875em;
}

/* Default modifiers */

.DayPicker-Day--today {
  color: #d0021b;
  font-weight: 500;
}

.DayPicker-Day--disabled {
  color: #dce0e0;
  cursor: default;
  background-color: #eff1f1;
}

.DayPicker-Day--outside {
  cursor: default;
  color: #dce0e0;
}

/* Example modifiers */

.DayPicker-Day--sunday {
  background-color: #f7f8f8;
}

.DayPicker-Day--sunday:not(.DayPicker-Day--today) {
  color: #dce0e0;
}

.DayPicker-Day--selected:not(.DayPicker-Day--disabled):not(.DayPicker-Day--outside) {
  color: #FFF;
  background-color: #4A90E2;
}

/* DayPickerInput */

.DayPickerInput {
  display: inline-block;
}

.DayPickerInput-OverlayWrapper {
  position: relative;
}

.DayPickerInput-Overlay {
  left: 0;
  position: absolute;
  background: white;
  box-shadow: 0 2px 5px rgba(0, 0, 0, .15);
}