<div id="wrap">
    
    <!-- section -->
    <div class="section">
      <div class="section__center">
        <div class="section__contents">
          
            <div id="button">
              <span>Click Me</span>
            </div>
          
        </div>
      </div>
    </div>
    <!--/section -->
    
  </div>  

html,
body {
  cursor: default;
  font-size: 18px;
  font-family: monospace;
  background-color: #fff;
  color: #333;
}

* {
  box-sizing: border-box;
  outline: none;
}

#wrap {
  width: 100%;
  position: relative;
}

.section {
  padding: 60px 0;
  position: relative;

  &__center {
    width: 100%;
    max-width: 1024px;
    margin: 0 auto;
  }

  &__contents {
    width: 100%;
    height: 100%;
    padding: 0 20px;
  }
}

#button {
  display: inline-block;
  position: relative;
  padding: 20px 10px;
  background-color: #000;
  color: #fff;
  font-weight: 700;
  font-size: 32px;
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;

  span {
    display: block;
    position: relative;
    z-index: 1;
  }

  &::before,
  &::after {
    content: '';
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    background-color: #000;
    width: 20%;
    
  }
  
  &::before {
    left: 0;
    margin-left: -10%;
    transform: skewX(20deg);
  }
  
  &::after {
    left: 100%;
    margin-left: -10%;
    transform: skewX(-20deg);
  }
}

$(function () {
  $('#button').click(function () {
    var $theBtn = $(this),
      buttonFontSize = parseInt($theBtn.css('font-size')),
      newButtonFontSize = buttonFontSize + 10 + 'px';

    $(this).css({
      fontSize: newButtonFontSize
    });
  });
});