@import url(https://fonts.googleapis.com/css?family=Lato);
body {
  display: flex;
  height: 100vh;
  justify-content: center;
  align-items: center;
  background: #ECEFFC;
}

.accordion-menu {
  width: 300px;
  padding: 0;
  border-radius: 8px;
  overflow: hidden;
  list-style-type: none;
}
.accordion-menu .accordion-menu__item .accrodion-menu__link {
  position: relative;
  display: block;
  padding: 16px 20px;
  font-family: Lato, sans-serif;
  text-decoration: none;
  color: white;
  background: #3498db;
  transition: 0.5s;
}
.accordion-menu .accordion-menu__item .accrodion-menu__link svg {
  margin: 0 10px -2px 0;
}
.accordion-menu .accordion-menu__item .accrodion-menu__link svg.chevron {
  position: absolute;
  top: 16px;
  right: 10px;
  color: white;
  transition: 0.5s;
}
.accordion-menu .accordion-menu__item .accrodion-menu__link:not(:last-child)::before {
  position: absolute;
  content: "";
  bottom: -7px;
  left: 20px;
  width: 15px;
  height: 15px;
  background: inherit;
  transform: rotate(45deg);
}
.accordion-menu .accordion-menu__item .accordion-menu__submenu {
  max-height: 0;
  padding: 0;
  background: #333;
  overflow: hidden;
  list-style-type: none;
  transition: 0.5s;
}
.accordion-menu .accordion-menu__item .accordion-menu__submenu a {
  display: block;
  padding: 1em 2em;
  color: white;
  text-decoration: none;
  font-size: 14px;
  transition: 0.5s;
}
.accordion-menu .accordion-menu__item .accordion-menu__submenu a:hover {
  background: #2980b9;
}
.accordion-menu .accordion-menu__item:target .accrodion-menu__link svg.chevron {
  transform: rotate(0.5turn);
}
.accordion-menu .accordion-menu__item:target .accordion-menu__submenu {
  max-height: 10em;
}