bl3skills.com/src/components/VaultHunter/index.css

.VaultHunter {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.trees, .tier {
  display: flex;
}

.treeName {
  text-align: center;
  color: white;
  order: 1;
  font-size: 1em;
}

.tree {
  display: flex;
  flex-direction: column;
  margin: 1rem;
  background-image: linear-gradient(0deg, var(--themeColor), var(--themeColor));
  background-size: calc(3.5rem * 3) calc(100% - 1.5rem);
  background-repeat: no-repeat;
  background-position: center bottom;
}

.tier {
  width: calc(3.5rem * 5);
  justify-content: center;
  position: relative;
}

.skill {
  position: relative;
  z-index: 1;
  flex: 0 1 auto;
  margin: 0.5rem;
  padding: 0rem;
  height: 2.5rem;
  width: 2.5rem;
  line-height: 1;
  display: flex;
  text-align: center;
  justify-content: center;
  align-items: center;
  color: white;
}

.skill:before {
  content: '';
  background-color: #333;
  position: absolute;
  bottom: 0;
  right: 0;
  height: 100%;
  width: 100%;
  z-index: -1;
}

.skill.bought:before {
  background-color: #A70;
}

.actionSkill:before {
  clip-path: polygon(50% 0%, 93.3% 25%, 93.3% 75%, 50% 100%, 6.7% 75%, 6.7% 25%);
}

.chevron:before {
  clip-path: polygon(0 0, 50% 25%, 100% 0, 100% 75%, 50% 100%, 0 75%);
}

.diamond:before {
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0 50%);
}

.augment, .actionSkill {
  margin: 0.25rem;
  padding: 0.25rem;
  height: 3em;
  width: 3em;
}

.augment {
  outline: 0.25em solid var(--themeColor);
  background-color: var(--themeColor);
}

.augment:first-child {
  position: absolute;
  left: 0;
}
.augment:last-child {
  position: absolute;
  right: 0;
}

.augment:only-child {
  position: relative;
  background-color: transparent;
  outline: none;
}

.blue {
  --themeColor: #007;
}
.red {
  --themeColor: #700;
}
.green {
  --themeColor: #070;
}