#menu__toggle {
  position: absolute;
  opacity: 0;
  z-index: 5;
  width: 26px;
  height: 26px;
  top: 20px;
  left: 20px;
  margin: 0;
  cursor: pointer;
}

#menu__toggle:checked ~ .menu__btn > span {
  transform: rotate(45deg);
}
#menu__toggle:checked ~ .menu__btn > span::before {
  top: 0;
  transform: rotate(0);
}
#menu__toggle:checked ~ .menu__btn > span::after {
  top: 0;
  transform: rotate(90deg);
}
#menu__toggle:checked ~ .menu__box {
  visibility: visible;
  left: 0;
}

.menu__btn {
  display: flex;
  align-items: center;
  position: fixed;
  top: 20px;
  left: 20px;
  width: 26px;
  height: 26px;
  cursor: pointer;
  z-index: 6;
}

.menu__btn > span,
.menu__btn > span::before,
.menu__btn > span::after {
  display: block;
  position: absolute;

  width: 100%;
  height: 2px;

  background-color: #d8d6d6;

  transition-duration: .25s;
}
.menu__btn > span::before {
  content: '';
  top: -8px;
}
.menu__btn > span::after {
  content: '';
  top: 8px;
}

.menu__box {
  display: flex;
  flex-direction: column;
  position: fixed;
  visibility: hidden;
  top: 0;
  left: -100%;
  z-index: 5;
  font-weight: 500;
  width: 300px;
  height: 100%;

  margin: 0;
  padding: 80px 0;

  list-style: none;

  background-color: #ECEFF1;
  box-shadow: 1px 0px 6px rgba(0, 0, 0, .2);

  transition-duration: .25s;
}

.menu__item {
  display: block;
  padding: 12px 24px;

  color: #333;

  font-family: Lava,"Helvetica Neue",Futura,serif,Calibri,Tahoma,Arial;
  font-size: 20px;

  text-decoration: none;

  transition-duration: .25s;
}
.menu__item:hover {
  background-color: #CFD8DC;
}

/* Hide mobile menu on desktop screens */
@media screen and (min-width: 981px) {
  .mobile-menu {
    display: none;
  }
}

/* Override main.css checkbox + label styles */
#menu__toggle + .menu__btn:before {
  display: none;
  content: none;
  border: none;
  background: none;
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  padding: 0;
}

#menu__toggle + .menu__btn {
  padding-left: 0;
  padding-right: 0;
  position: fixed;
  display: flex;
}