3-styles.css

.menu {
  display: flex;
  flex-direction: column;
}

.menu-open {
  -webkit-appearance: none;
  -moz-appearance: none;
}

.menu-open-button {
  display: flex;
  flex-direction: column;
  border-radius: 50%;
  background-color: #d73953;
  height: 2rem;
  width: 2rem;
  margin-bottom: 5px;
}

.menu-line {
  margin: 1px auto;
  width: 10px;
  height: 1px;
  background: white;
}

.menu-item {
  display: none;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
  border-radius: 50%;
  background-color: #d73953;
  height: 2rem;
  width: 2rem;
  margin-bottom: 5px;
}

.menu-open-button:hover {
  height: 2.1rem;
  width: 2.1rem;
  transition: 0.1s ease-out;
}

.menu-open-button:hover .menu-line-1 {
  margin-top: 13px;
  transition: 0.1s ease-out;
}

.menu-open-button:hover .menu-line {
  margin-top: 6px auto;
}

.menu-line-1 {
  margin-top: 12px;
}

.menu-open:checked ~ .menu-open-button,
.menu-open:checked ~ .menu-item {
  height: 1.5rem;
  width: 1.5rem;
  font-size: 7px;
}

.menu-open:checked ~ .menu-open-button > .menu-line-3 {
  display: none;
}

.menu-open:checked ~ .menu-open-button > .menu-line-1 {
  transform: rotate(45deg);
  margin-top: 11.5px;
  transition: 0.1s ease-out;
}

.menu-open:checked ~ .menu-open-button > .menu-line-2 {
  transform: rotate(-45deg);
  margin-top: -1.5px;
  transition: 0.1s ease-out;
}

.menu-open:checked ~ .menu-item {
  display: flex;
}

.menu-open:checked ~ .menu-item:hover {
  background-color: white;
  color: #d73953;
  border: 0.5px solid #d73953;
}