@charset "UFT-8";

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  /* color: rgba(255, 255, 255, 1); */
}
body {
  height: 100vh;
  background-color: #2b2b2b;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
ul {
  display: flex;
}
  
ul li {
  width: 20px;
  height: 20px;
  background: #777;
  margin: 0 20px;
  border-radius: 50%;
  transition: 0.5s;
  cursor: pointer;
  position: relative;
}

ul li:hover {
  background-color: #86ff3b;
  box-shadow: 0 0 0 4px #2b2b2b,
              0 0 0 6px #86ff3b
}
ul li .content {
  position: absolute;
  bottom: 55px;
  width: 400px;
  background-color: #fff;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: 0.5s;
  box-sizing: border-box;
  transform: translate(-50%, -50px);
}
/* ul li:nth-child(2) .content,
ul li:nth-child(3) .content {
  opacity: 0;
  visibility: hidden;
} */
ul li .content::before {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  background-color: #fff;
  bottom: -10px;
  transform: rotate(45deg);
  left: 200px;
}

ul li:hover .content {
  visibility: visible;
  opacity: 1;
  transform: translate(-50%, 0);
}

ul li .content h2 {
  margin: 0;
  padding: 0;
}