#calendar-post-navigator {
  font-family: sans-serif;
  max-width: 900px;
  margin: auto;
  position: relative;
  overflow: hidden;
}
#calendar-post-navigator > div {
  width: 100%;
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  transition: transform 0.4s ease-in-out;
  opacity: 0;
}
#calendar-post-navigator > .slide-center {
  display: block;
  transform: translateX(0);
  position: relative;
  opacity: 1;
  animation: fadeInHighlight 0.4s ease-in-out;
}
.slide-left,
.slide-right {
  display: block;
}
.slide-left {
  transform: translateX(-100%);
}
.slide-right {
  transform: translateX(100%);
}

@keyframes fadeInHighlight {
  0% { background-color: #ffffcc; }
  100% { background-color: transparent; }
}

.month {
  margin: 1em 0;
}
.days {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
.day {
  padding: 10px;
  background: #eee;
  cursor: pointer;
  border-radius: 5px;
}
.category-view ul {
  list-style: none;
  padding: 0;
}
.category-view li {
  padding: 10px;
  background: #ddf;
  margin: 5px 0;
  cursor: pointer;
  border-radius: 5px;
}
.post-view h3 {
  border-bottom: 1px solid #ccc;
  margin-top: 1em;
}