.simple-menu {
  position: absolute;
  top: -1rem;
  left: 100%;
  margin: 0 0.5rem;
  background: #fff;
  box-shadow: 0px 0px 20px rgba(170, 189, 206, 0.25);
  border-radius: 5px;
  width: 27.8rem;
  padding: 1rem 0;
  transition: opacity 0.25s, visibility 0.25s, transform 0.25s;
  opacity: 0;
  visibility: hidden;
}
.simple-menu:before {
  content: "";
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 100%;
  width: 0.5rem;
  height: 100%;
}

.simple-menu__list {
    margin: 0;
    padding: 0;
    list-style: none;
    font-size: 1.5rem;
    line-height: 2rem;
    font-weight: 400;
}

.simple-menu__item {
  position: relative;
  margin: 0 0 0.5rem;
}

.menu-cat__item:hover > .simple-menu,
.simple-menu__item:hover > .simple-menu {
  opacity: 1;
  visibility: visible;
}