@import url("https://fonts.googlesapis.com/css?family=Poppins:200,300,400,500,600,700,800,900&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #262433;
}

.navigation {
  position: relative;
  width: 540px;
  height: 120px;
  background: #242433;
  box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.5),
    inset 5px 5px 20px rgba(255, 255, 255, 0.2),
    inset -5px -5px 15px rgba(0, 0, 0, 0.75);
  border-radius: 25px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.navigation li {
  position: relative;
  list-style: none;
  width: 80px;
  margin: 0 5px;
}

.navigation li::before {
  content: "";
  position: absolute;
  top: 35px;
  left: 50%;
  transform: translateX(-50%);
  width: 5px;
  height: 5px;
  background: #222;
  border-radius: 50%;
  transition: 0.5s;
}

.navigation li.active::before {
  background: #0f0;
  box-shadow: 0 0 5px #0f0, 0 0 10px #0f0, 0 0 20px #0f0, 0 0 30px #0f0,
    0 0 40px #0f0, 0 0 50px #0f0;
}

.navigation li a {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-decoration: none;
}

.navigation li a .icon {
  position: absolute;
  font-size: 1.75em;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #aaa;
  border-radius: 50px;
  transition: 0.5s;
  transition-delay: 0.2s;
}

.navigation li.active a .icon {
  background: #29fd53;
  color: #fff;
  transform: translateY(-55px);
  box-shadow: 5px 5px 7px rgba(0, 0, 0, 0.25),
    inset 2px 2px 3px rgba(255, 255, 255, 0.25),
    inset -3px -3px 5px rgba(0, 0, 0, 0.5);
  transition-delay: 0s;
}

.navigation li a .icon::before {
  content: "";
  position: absolute;
  inset: 10px;
  background: #2f363e;
  border-radius: 50%;
  box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.5),
    inset 2px 2px 3px rgba(255, 255, 255, 0.25),
    inset -3px -3px 5px rgba(0, 0, 0, 0.5);
  transform: scale(0);
  transition: 0.5s;
}

.navigation li.active a .icon::before {
  transform: scale(1);
}

.navigation li a .text {
  position: absolute;
  font-size: 0.75em;
  color: #2f363e;
  opacity: 0;
  transform: translateY(20px);
  padding: 2px 10px;
  background: #fff;
  border-radius: 15px;
  box-shadow: 5px 5px 7px rgba(0, 0, 0, 0.25),
    inset -3px -3px 5px rgba(0, 0, 0, 0.5);
  transition: 0.5s;
  transition-delay: 0s;
}

.navigation li.active a .text {
  opacity: 1;
  transform: translateY(10px);
  transition-delay: 0.2s;
}