nav {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.menu {
  position: -webkit-sticky;
	position: fixed;
	top: 0;
  right: 0; 
  display: inline-block;
}

.menu-icon {
  display: inline-block;
  width: 30px;
  height: 30px;
  background-color: #333;
  cursor: pointer;
}

.menu-items {
  position: absolute;
  top: 100%;
  right: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  background-color: #f2f2f2;
  border: 1px solid #ccc;
  border-top: none;
  display: none;
}

.menu-items li {
  padding: 10px;
}

.menu-items li a {
  text-decoration: none;
  color: #333;
}

input[type="checkbox"] {
  display: none;
}

input[type="checkbox"]:checked ~ .menu-items {
  display: block;
}

.menu-icon {
  position: relative;
  display: inline-block;
  width: 30px;
  height: 30px;
  background-color: #333;
  cursor: pointer;
}

.menu-icon::before,
.menu-icon::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 2px;
  background-color: #fff;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.menu-icon::before {
  top: calc(50% - 6px);
}

.menu-icon::after {
  top: calc(50% + 4px);
}