<div class='flex'> 
  <p class='p'>Expanding hamburger menu that displays the intent of the button more clearly than a typical hamburger menu icon.</p>
  <div class='wrapper'>
      <div class='bun'>
          <div class='bigmac'>
              <span class='meat'>MENU</span>
          </div>
      </div>
  </div>
</div>
@import url(https://fonts.googleapis.com/css?family=Lato);


//vars
$primary   : #F5F8DE;
$secondary : #9E2B25;

$menu      : $secondary;
//

* {
  box-sizing : border-box;
}

body {
  width : 100%;
  height : 100%;
  background-color : $primary;
}

.p {
  max-width   : 740px;
  padding     : 20px;
  margin      : 50px auto 0;
  font-family : 'Lato', sans-serif;
  font-size   : 1.5em;
  line-height : 1.5;
  color       : $secondary;
}

.wrapper {
  width  : 60px;
  margin : 0 auto;
}

.bigmac {
  position         : absolute;
  top              : 27px;
  left             : 10px;
  height           : 6px;
  width            : 40px;
  background-color : $secondary;
  transition       : background-color 100ms ease-in;
  
  &::before {
    content          : '';
    position         : absolute;
    top              : -12px;
    left             : 0;
    height           : 6px;
    width            : 40px;
    background-color : $secondary;
    transition       : all 150ms ease-in-out;
  }
  
  &::after {
    content          : '';
    position         : absolute;
    bottom           : -12px;
    left             : 0;
    height           : 6px;
    width            : 40px;
    background-color : $secondary;
    transition       : all 150ms ease-in-out;
  }
  
  .meat {
    height          : 60px;
    width           : 60px;
    position        : absolute;
    top             : -27px;
    left            : -10px;
    font-family     : 'Lato', sans-serif;
    font-size       : 0em;
    line-height     : 60px;
    text-align      : center;
    text-decoration : none;
    color           : $menu;
    cursor          : pointer;
    user-select     : none;
    z-index         : 2;
    transition      : font-size 275ms ease-out;
  }

}

.bun {
  position : relative;
  width    : 60px;
  height   : 60px;
  
  &:hover {
    .bigmac {
      background-color : transparent;

      .meat {
        font-size : 1.25em;
      }

      &::before {
        width : 60px;
        left  : -10px;
        top   : -22px;
      }

      &::after {
        width  : 60px;
        left   : -10px;
        bottom : -22px;
      }

    }

  }

}

@media screen and (max-width : 30em) {
  .bigmac {
    background-color : transparent;

    .meat {
      font-size : 1.25em;
    }

    &::before {
      width : 60px;
      left  : -10px;
      top   : -22px;
    }

    &::after {
      width  : 60px;
      left   : -10px;
      bottom : -22px;
    }

  }

}

.flex {
    display: flex;
    flex-direction: column;
}
View Compiled
let burger = document.querySelector('.meat');

burger.addEventListener('click', () => {
  burger.textContent === "MENU" ? burger.textContent = "CLOSE" : burger.textContent = "MENU";
});
View Compiled

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

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