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CSS Base

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              <svg viewBox="0 0 800 600" class="">
  <path d="M300,220 C300,220 520,220 540,220 C740,220 640,540 520,420 C440,340 300,200 300,200" class="top_bar" />

  <path d="M300,320 L540,320" class="middle_bar" />

  <path d="M300,210 C300,210 520,210 540,210 C740,210 640,530 520,410 C440,330 300,190 300,190" class="bottom_bar" transform="translate(480, 320) scale(1, -1) translate(-480, -318)" />
</svg>

            
          
!
            
              body{
  background: rebeccapurple;
}

svg{
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  cursor: pointer;
}

svg path{
  stroke-width: 10;
  stroke-linecap: round;
  stroke: #fff;
  fill: none;
  transition: all .5s ease-in-out;
}

/* In menu form */

.top_bar,
.bottom_bar{
  stroke-dasharray: 240px 910px;
}

.middle_bar{
  stroke-dasharray: 240px 240px;
}

/* In cross form */

.open .top_bar,
.open .bottom_bar{
  stroke-dashoffset: -650px;
}

.open .middle_bar{
  stroke-dasharray: 0px 220px;
  stroke-dashoffset: -120px;
}
            
          
!
            
              const menu = document.querySelector("svg");
menu.addEventListener("click", morph);

function morph() {
  menu.classList.toggle("open");
}
            
          
!
999px
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