// HTML
<div class="menu-wrap">
  <input type="checkbox" class="toggler" />
  <div class="hamburger"><div></div></div>
</div>

//CSS
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.menu-wrap {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1;
}

.menu-wrap .toggler {
  position: absolute;
  top: 0;
  left: 0;
  height: 60px;
  width: 60px;
  cursor: pointer;
  z-index: 2;
  opacity: 0;
}

.menu-wrap .hamburger {
  position: absolute;
  top: 0;
  left: 0;
  height: 60px;
  width: 60px;
  padding: 1rem;
  background-color: teal;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.menu-wrap .hamburger > div {
  width: 100%;
  height: 2px;
  background-color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  transition: all 0.4s ease;
  z-index: 2;
  position: relative;
}

.menu-wrap .hamburger > div::before,
.menu-wrap .hamburger > div::after {
  content: '';
  position: absolute;
  height: 2px;
  z-index: 2;
  width: 100%;
  background: inherit;
  transform: translateY(10px);
}

.menu-wrap .hamburger > div::before {
  transform: translateY(-10px);
}

.menu-wrap .toggler:checked + .hamburger > div {
  transform: rotate(135deg);
}

.menu-wrap .toggler:checked + .hamburger > div::before,
.menu-wrap .toggler:checked + .hamburger > div::after {
  transform: rotate(90deg);
}

.menu-wrap .toggler:checked:hover + .hamburger > div {
  transform: rotate(225deg);
}