.menu {
  display: flex;
  justify-content: center;
  position: absolute;
  bottom: 0;
  margin: 10px;
  z-index: 98;
}

#visualization {
  width: 100%;
  height: auto;

  background:
    url('../images/Abysal\ Well.JPG');
  
  background-position: top center;
  background-repeat: no-repeat;
  background-size: cover; 
  mix-blend-mode: overlay;
  mask-image: linear-gradient(to bottom, rgb(255, 255, 255), transparent);
  
}

.vis-item a{
  color: rgb(255, 255, 255);
  background-color: rgb(54, 54, 54);
  padding: 2px;
  font-weight: bold;
}

.vis-item a:hover{
  color: rgb(245, 223, 112);
}

.vis-item.vis-selected .vis-item-content {
  background-color: #222107;   /* your desired color */
  /* border-color: #2E7D32; */
}



.timeline-menu {
  display: flex;
  position: absolute;
  flex-direction: row;
  height: 100%;
  width: 100%;
  z-index: 98;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
}

.timeline-menu p{
  pointer-events: auto;
  cursor: pointer;
  padding: 20px;
  margin: 5px;
  color: white;
  font-weight: bold;
  font-size: 20px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}

.timeline-right{
  right: 0;
  border-radius: 3px 0 0 3px;
}

.timeline-right:hover, .timeline-left:hover{
  background-color: rgba(0,0,0,0.8);
}