CSS

.class::before {
  /* must have content */
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: black;
  opacity: 0.6;
}
// 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);
}
// HTML
<div class="menu-wrap">
      <input type="checkbox" class="toggler" />
      <div class="hamburger"><div></div></div>
      <div class="menu">
        <div>
          <div>
            <ul>
              <li><a href="#">Home</a></li>
              <li><a href="#">About</a></li>
              <li><a href="#">Services</a></li>
              <li><a href="#">Contact</a></li>
            </ul>
          </div>
        </div>
      </div>
    </div>

// CSS
.menu-wrap .menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  visibility: hidden;
}

.menu-wrap .menu > div {
  background-color: steelblue;
  flex: none;
  width: 200vw;
  height: 200vw;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  transform: scale(0);
  transition: all 1s ease;
}

.menu-wrap .menu > div > div {
  max-width: 90vw;
  max-height: 100vh;
  opacity: 0;
  transition: opacity 0.4s ease 0.4s;
  text-align: center;
}

.menu-wrap .menu li {
  list-style: none;
  padding: 1rem 0;
  font-size: 1.5rem;
}

.menu-wrap .menu li a {
  text-decoration: none;
  color: white;
  transition: color 0.4s ease;
}

.menu-wrap .toggler:checked ~ .menu {
  visibility: visible;
}

.menu-wrap .toggler:checked ~ .menu > div {
  transform: scale(1);
}

.menu-wrap .toggler:checked ~ .menu > div > div {
  opacity: 1;
}
.test::after {
  content: '';
  position: absolute;
  border: solid;
  border-width: 0px 10px 20px 10px;
  border-color: transparent transparent black transparent;
}

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