including a hamburger icon in a header tag in html code example

Example 1: burger menu css

/* Link to Codepen in source for PoC */

<style>
.container {
  background: dodgerblue;
  padding: 20px;
  height: 70px;
}

#hamburger {
  width: 40px;
  height: 40px;
  display: block;
  position: relative;
  float: right;
  transform: rotate(0deg);
  transition: .5s ease-in-out;
  cursor: pointer;
}
#hamburger span {
  display: block;
  position: absolute;
  height: 4px;
  width: 100%;
  background: white;
  border-radius: 9px;
  opacity: 1;
  left: 0;
  transform: rotate(0deg);
  transition: .25s ease-in-out;
}
#hamburger span:nth-child(1) {
  top: 0px;
}
#hamburger span:nth-child(2) {
  top: 12px;
}
#hamburger span:nth-child(3) {
  top: 24px;
}
#hamburger.open span:nth-child(1) {
  top: 14px;
  transform: rotate(135deg);
}
#hamburger.open span:nth-child(2) {
  opacity: 0;
  left: -60px;
}
#hamburger.open span:nth-child(3) {
  top: 14px;
  transform: rotate(-135deg);
}

</style>
<body>
  <div class="container">
       <div id="hamburger">
          <span></span>
          <span></span>
          <span></span>
      </div> 
  </div>
</body>

Example 2: how can i make a menu bar appear by clicking an icon? in css?

/*you can use the :checked or the :focus property on the icon you want the user to click and than change the display of the menu from none to whatver you want*/
#yourmenu{
  /*style*/
  display: none;
}
#yourbutton{
  /*style*/
}
#yourbutton:checked > yourmenu{
  display: block;/*whathever value you want*/
}
/*sorry for the shitty english, hope to help someone with this concept*/

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