.fc-direction-ltr .fc-button-group>.fc-button:not(:last-child)
 {
    background-color: #d4f7ff;
}

.fc-direction-ltr .fc-toolbar>*>:not(:first-child) {
  background-color: #d4f7ff;
}

.fc .fc-button-group>.fc-button {
    background-color: #d4f7ff;
}