*, *::before, *::after {
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  background-color: var(--background-color);
  color: white;
}
h1,.lead { text-align: center; color: #fff; }
h1 { margin-top: 150px; }
:root {
  --icon-size: 2rem;
  --indicator-spacing: calc(var(--icon-size) / 8);
  --border-radius: calc(var(--icon-size) / 4);
  --nav-item-padding: calc(var(--icon-size) / 2);
  --background-color: #333;
}

.navbar-container {
  background-color: white;
  border-radius: var(--border-radius);
  width: max-content;
  margin: 0 auto;
  margin-top: 10rem;
  padding: 0 calc(var(--nav-item-padding) * 1.5);
}

.list {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
}

.list a {
  color: #333;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--nav-item-padding);
}

.list .text {
  font-size: .8em;
  opacity: 0;
  pointer-events: none;
  transition: 250ms ease-in-out;
  position: absolute;
  bottom: calc(.5 * var(--nav-item-padding));
  transform: translateY(50%);
}

.list .icon {
  position: relative;
  transition: 250ms ease-in-out;
}

.list .icon svg {
  fill: currentColor;
  width: var(--icon-size);
  height: var(--icon-size);
  display: block;
}

.list .active .text {
  pointer-events: all;
  opacity: 1;
  transform: translateY(0);
}

.list .active .icon {
  transform: translateY(calc(-50% - var(--nav-item-padding)));
}

/* .list .active::before {
  content: "";
  box-sizing: content-box;
  position: absolute;
  width: var(--border-radius);
  height: var(--border-radius);
  background-color: white;
  z-index: 1;
  top: calc(-1 * var(--indicator-spacing));
  left: calc(.2 * var(--indicator-spacing));
  transform: translateX(-100%);
  border-top-right-radius: 100%;
  border-width: calc(var(--indicator-spacing));
  border-color: var(--background-color);
  border-style: solid;
  border-bottom: none;
  border-left: none;
}

.list .active::after {
  content: "";
  box-sizing: content-box;
  position: absolute;
  width: var(--border-radius);
  height: var(--border-radius);
  background-color: white;
  z-index: 1;
  top: calc(-1 * var(--indicator-spacing));
  right: calc(.2 * var(--indicator-spacing));
  transform: translateX(100%);
  border-top-left-radius: 100%;
  border-width: calc(var(--indicator-spacing));
  border-color: var(--background-color);
  border-style: solid;
  border-bottom: none;
  border-right: none;
} */

.list {
  position: relative;
}

.indicator {
  position: absolute;
  left: calc(var(--position) * (var(--icon-size) + var(--nav-item-padding) * 2));
  transition: 250ms ease-in-out;
}

.indicator::after,
.indicator::before {
  content: "";
  position: absolute;
  border-radius: 100%;
}

.indicator::after {
  background-color: hsl(100, 100%, 50%);
  width: calc(var(--icon-size) * 2);
  height: calc(var(--icon-size) * 2);
  top: calc(-1 * var(--icon-size));
}
.indicator::before {
  background-color: var(--background-color);
  width: calc((var(--icon-size) + var(--indicator-spacing)) * 2);
  height: calc((var(--icon-size) + var(--indicator-spacing)) * 2);
  top: calc(-1 * var(--icon-size) - var(--indicator-spacing));
  left: calc(-1 * var(--indicator-spacing));
}

.corners::before {
  content: "";
  box-sizing: content-box;
  position: absolute;
  width: var(--border-radius);
  height: var(--border-radius);
  background-color: white;
  z-index: 1;
  top: calc(-1 * var(--indicator-spacing));
  left: calc(.2 * var(--indicator-spacing));
  transform: translateX(-100%);
  border-top-right-radius: 100%;
  border-width: calc(var(--indicator-spacing));
  border-color: var(--background-color);
  border-style: solid;
  border-bottom: none;
  border-left: none;
}

.corners::after {
  content: "";
  box-sizing: content-box;
  position: absolute;
  width: var(--border-radius);
  height: var(--border-radius);
  background-color: white;
  z-index: 1;
  top: calc(-1 * var(--indicator-spacing));
  left: calc(var(--icon-size) * 2 + -.2 * var(--indicator-spacing));
  border-top-left-radius: 100%;
  border-width: calc(var(--indicator-spacing));
  border-color: var(--background-color);
  border-style: solid;
  border-bottom: none;
  border-right: none;
}