body .sticky-right {
  bottom: 10px;
  display: block;
  height: 40px;
  line-height: 38px;
  color: #fff;
  opacity: 0;
  position: fixed;
  right: -50px;
  text-align: center;
  width: 40px;
  z-index: 999;
  border-style: solid;
  border-width: 1px;
  font-size: 18px;
  background: rgba(0, 0, 0, 0.5);
}
body .down-arrow.dark {
  bottom: 60px;
  border: 0;
  border-radius: 50%;
  transition: 500ms;
} 
.black {
  font-size: 26px;
}

body .down-arrow.dark:hover {
  background-color: rgba(10, 90, 175);
  width: 500px;
  height: 300px;
  transition: 500ms;
  border-radius: 10px;
}
.down-arrow.dark .event-content > p {
  visibility: hidden;
  opacity: 0;
  transition: visibility 0s, opacity 0.5s linear;
}

.down-arrow.dark:hover .event-content > p {
  visibility: visible;
  opacity: 1;
  transition: visibility 0s, opacity 0.5s linear;
}