.header__hamburguer.open + .header__inline-menu {
  width: 100%;
  visibility: visible;
  transform: translateX(0);
}

.header__hamburguer .icon-plus {
  -moz-transition: all 250ms ease;
  -o-transition: all 250ms ease;
  -webkit-transition: all 250ms ease;
  transition: all 250ms ease;
}

.header__hamburguer.open .icon-plus {
  transform: rotate(45deg);
}