[Webデザイン]検索バー

<div class="search">
  <input type="text" />
  <div class="material-icons">search</div>
</div>

.search {
  display: inline-block;
  height: 34px;
  position: relative;
}
.search input {
  width: 36px;
  height: 34px;
  padding: 4px 10px;
  border: 1px solid #ccc;
  box-sizing: border-box;
  border-radius: 5px;
  outline: none;
  background: #fff;
  color: #777;
  font-size: 12px;
  transition: width 0.4s;
}
.search input:focus {
  width: 190px;
  border-color: #669900;
}
.search .material-icons {
  height: 24px;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 5px;
  margin: auto;
  transition: 0.4s;
}
.search.focused .material-icons {
  opacity: 0;
}

const searchEl = document.querySelector('.search')
const searchInputEl = searchEl.querySelector('input')

searchEl.addEventListener('click',function(){
  searchInputEl.focus();
})

searchInputEl.addEventListener('focus', function(){
  searchEl.classList.add('focused')
  searchInputEl.setAttribute('placeholder','통합검색')
})

searchInputEl.addEventListener('blur', function(){
  searchEl.classList.remove('focused')
  searchInputEl.setAttribute('placeholder','')
})