.icon-hamburger {
  background: #fff;
  border: 1px solid #ccc;
  cursor: pointer;
  height: 50px;
  position: relative;
  width: 50px;
  display: none;
  margin-bottom: 0.4em;
}

.icon-hamburger span {
  background: #cccccc;
  display: block;
  height: 16%;
  left: 50%;
  margin: -8% 0 0 -42%;
  position: absolute;
  top: 50%;
  width: 84%;
}

.icon-hamburger span::before,
.icon-hamburger span::after {
  background: #cccccc;
  content: "";
  display: block;
  height: 100%;
  left: 50%;
  margin: -8% 0 0 -50%;
  position: absolute;
  top: 50%;
  width: 100%;
}

.icon-hamburger span::before {
  margin-top: -38%;
}

.icon-hamburger span::after {
  margin-top: 19%;
}

@media screen and (max-width: 768px) {
  .icon-hamburger {
    display: inline-block;
  }
}