HTMLify

:root {
  --primary-item: #3B3E40;
  --background-item: #EFEFEF;
  --gray: #D5D4D5;
  --background: #2C2C2C;
  --item-non-hover: #92969A
}

html {
	font-size: 16px;
	font-family: "Poppins", serif;
}

body {
	background: var(--background);
	height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

* {
  box-sizing: border-box;
}

.accordion-container {
  min-width: 330px;
  padding: 16px;
  border-radius: 16px;
  overflow: hidden;
  background-color: #FCFCFC;
}

.main-item {
  border-radius: 8px;
  padding: 12px;
  display: flex;
  cursor: pointer;
  align-items: center;
  justify-content: start;
  gap: 8px;
  transition: all ease-in-out 0.25s;
  color: var(--item-non-hover);
}


.main-item:hover {
  background-color: var(--background-item);
  color: var(--primary-item);
}

.main-item svg {
  stroke: var(--item-non-hover);
  transition: all ease-in-out 0.25s;
}

.main-item:hover svg {
  stroke: var(--primary-item);
}

.main-item--open {
  border-radius: 8px;
  background-color: var(--background-item);
  transition: all 200ms;
  color: var(--primary-item);
}

.main-item--open:hover {
  color: var(--primary-item);
  border-radius: 8px;
  background-color: var(--background-item);
}

.main-item--open svg {
  stroke: var(--primary-item);
}

.accordion-container > ul {
  max-height: 0px;
  list-style-type: none;
  margin: 0px;
  padding-left: 14px;
  opacity: 0;
  font-size: smaller;
  visibility: hidden;
  transition: all ease-in-out 0.2s;
}

.main-item--open + ul {
  visibility: visible;
  max-height: 400px;
  padding-left: 22px;
  opacity: 1;
  display: flex;
  align-items: center;
  flex-direction: column;
}

.accordion-container > ul > li {
  height: 48px;
  display: flex;
  width: 100%;
  align-items: center;
}

.accordion-container > ul > li > a {
  color: var(--item-non-hover);
  padding: 16px 8px;
  height: 38px;
  line-height: 38px;
  display: flex;
  align-items: center;
  text-decoration: none;
  border-radius: 8px;
}

.accordion-container > ul > li:hover {
  color: var(--primary-item);
  cursor: pointer;
  font-weight: 700;
}

.accordion-container > ul > li:hover > a {
  color: var(--primary-item);
  background-color: var(--background-item);
  width: 100%;
}

.expand-icon {
  width: 24px;
  height: 24px;
  margin-left: auto;
}

.main-item--open > .expand-icon {
  transform: rotate(-90deg);
}

.line-vertical {
  display: block;
  background-color: var(--background-item);
  width: 2px;
  height: 48px;
}

.accordion-container > ul > 
li:last-child > .line-vertical {
  height: 25px;
  align-self: flex-start;
}

.line-horizontal {
  display: block;
  background-color: var(--background-item);
  height: 2px;
  min-width: 12px;
}