.header__toggle {
  width: 50px;
  height: 50px;
  background-color: rgba(146, 185, 172, 0.85);
  position: absolute;
  top: 5px;
  right: -50px;
  display: flex;
  cursor: pointer;
  transition: opacity .5s;
  border-radius: 15px;
  overflow: hidden;
}

.header__toggle:hover {
  opacity: .8;
}