JSFiddle - React, Tailwind, and code Playground

by 규연 황

HTML

<div class="wrap">
  <div class="gnb">
    <ul>
      <li>menu1</li>
      <li>menu2</li>
      <li>menu3</li>
    </ul>
  </div>
  
  <p>i love story</p>
  <p>i love story</p>
  <p>i love story</p>
  <p>i love story</p>
  <p>i love story</p>
  <p>i love story</p>
  <p>i love story</p>
</div>

CSS

.wrap {
  height: 2000px;
}
.gnb li {
  float: left;
  width:33.33%;
  color: #eeeeee;
  font-size: 14px;
  text-align: center;
  height: 60px;
  line-height: 60px;
  background: #000000;
  box-sizing: border-box; 
  transition: all ease-in .3s;
}
.gnb.on {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
}
.gnb.on li {
  height: 30px;
  line-height: 30px;
  background-color: #ff6600;
}

JavaScript

var gnb = document.querySelector('.gnb')


window.addEventListener('scroll', function(){
	//console.log(window.pageYOffset);
  if(window.pageYOffset > 0) {
  	gnb.classList.add('on');
  } else {
  	gnb.classList.remove('on');
  }
})