.main-btn {
  position: relative;
  width: 1.5rem;
  height: 2rem;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: auto;
  border-radius: 50%;
  cursor: pointer;
  background-size: 100% 200%;
  background-position: 0% 100%;
  color: #fff;
  transition: 400ms;
  transform: rotate(0deg);
  opacity: 1;
}
.custom-menu-toggle {
  position: absolute;
  width: 2.5rem;
  height: 0.35rem;
  border-radius: 2px;
  background-color: white;
  display: block;
  margin: auto;
  transition: 400ms;
}
.custom-menu-toggle:before {
  position: absolute;
  width: 2.5rem;
  height: 0.35rem;
  border-radius: 2px;
  background-color: white;
  display: block;
  margin: auto;
  transition: 400ms;
  content: "";
  backface-visibility: hidden;
  transform: rotate(0deg) translateY(10px);
}
.custom-menu-toggle:after {
  position: absolute;
  width: 2.5rem;
  height: 0.35rem;
  border-radius: 2px;
  background-color: white;
  display: block;
  margin: auto;
  transition: 400ms;
  content: "";
  backface-visibility: hidden;
  transform: rotate(0deg) translateY(-10px);
}

.main-btn.active .custom-menu-toggle {
  background-color: rgba(255, 255, 255, 0);
}
.main-btn.active .custom-menu-toggle:before {
  position: absolute;
  width: 2.3rem;
  height: 0.3rem;
  border-radius: 2px;
  background-color: white;
  display: block;
  margin: auto;
  transition: 400ms;
  content: "";
  transform: rotate(45deg) translateY(0px);
}
.main-btn.active .custom-menu-toggle:after {
  position: absolute;
  width: 2.3rem;
  height: 0.3rem;
  border-radius: 2px;
  background-color: white;
  display: block;
  margin: auto;
  transition: 400ms;
  content: "";
  transform: rotate(-45deg) translateY(0px);
}