propernaming/css/header.css

body {
  margin: 0; }

.header-fixed {
  position: fixed;
  top: 0;
  z-index: 1;
  width: 100%;
  background-color: white; }

.navbar {
  display: flex;
  line-height: 60px; }

.navbar .logo {
  flex: 3;
  padding-left: 2em; }

.navbar nav {
  flex: 8; }

.navbar label {
  user-select: none;
  cursor: pointer;
  padding: 28px 20px;
  position: relative;
  z-index: 3; }

.navbar label i {
  height: 2px;
  position: relative;
  transition: background .2s ease-out;
  width: 18px;
  font-style: normal;
  font-weight: normal; }

.navbar label i:before,
.navbar label i:after {
  content: '';
  height: 100%;
  position: absolute;
  transition: all .2s ease-out;
  width: 100%; }

.navbar label i,
.navbar label i:before,
.navbar label i:after {
  display: block;
  background: black; }

.navbar label i:before {
  top: 5px; }

.navbar label i:after {
  top: -5px; }

.navbar #navbar-toggle {
  display: none; }

.header #navbar-toggle:checked ~ .menu {
  visibility: visible;
  opacity: 0.99; }

.header #navbar-toggle:checked ~ label {
  background: #212121;
  border-radius: 50%; }

.header #navbar-toggle:checked ~ label i {
  background: transparent; }

.header #navbar-toggle:checked ~ label i:before {
  transform: rotate(-45deg); }

.header #navbar-toggle:checked ~ label i:after {
  transform: rotate(45deg); }

.header #navbar-toggle:checked ~ label:not(.steps) i:before,
.header #navbar-toggle:checked ~ label:not(.steps) i:after {
  top: 0; }

@media (max-width: 800px) {
  .navbar nav {
    visibility: hidden;
    opacity: 0;
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    transition: all 0.3s ease-out;
    display: table;
    background: #ddd; }
  .navbar nav ul {
    margin: 0;
    padding: 20px 0;
    display: table-cell;
    vertical-align: middle; }
  .navbar nav li {
    display: block;
    padding: 20px 0;
    text-align: center;
    font-size: 50px;
    min-height: 50px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease-out; } }

@media (min-width: 800px) {
  .navbar nav ul {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: space-around;
    text-align: right;
    list-style: none; }
  .navbar nav li {
    flex: 1; }
  .navbar nav li a {
    display: block;
    padding: 0 8px;
    line-height: 60px; }
  .navbar label {
    display: none; }
  .hidden-md {
    display: none !important; } }