<label class="hamburger">
  <input type="checkbox">
  <span class="bar top"></span>
  <span class="bar mid"></span>
  <span class="bar bot"></span>
</label>

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  width: 40px;
}
.hamburger input {
  display: none;
}
.bar {
  display: block;
  width: 100%;
  height: 4px;
  background-color: #1f2937;
  border-radius: 4px;
  transition: transform 0.4s, opacity 0.4s;
}
.hamburger input:checked ~ .top {
  transform: translateY(10px) rotate(45deg);
}
.hamburger input:checked ~ .mid {
  opacity: 0;
}
.hamburger input:checked ~ .bot {
  transform: translateY(-10px) rotate(-45deg);
}