<div class="container">
  <section class="news">
    <div class="news__item">Новость</div>
    <div class="news__item">Новость</div>
    <div class="news__item">Новость</div>
    <div class="news__item">Новость</div>
    <div class="news__item">Новость</div>
  </section>
  <aside class="sideBar">Боковое меню</aside>
</div>

.container{
  display: flex;
  max-width: 1200px;
  background: #eee;
  margin: 0 auto;
}

.news{
  display: flex;
  flex-wrap: wrap;
  flex-grow: 1;
  background: lightgreen;
}

.news__item{
  flex-basis: 200px;
  flex-grow: 1;
  height: 300px;
  margin: 10px;
  background: lightblue;
}

.sideBar{
  flex-grow: 1;
  max-width: 400px;
}

let wrap = document.querySelector('.wrap');

wrap.onclick = ()=> wrap.classList.toggle('noMagic');

.wrap{
  position: relative;
  width: 500px;
  height: 200px;
  background: lightblue;
  margin: 0 auto;
}

.wrap::before{
  position: absolute;
  content: 'Кликни на меня, детка!';
  height: 50px;
  width: 100%;
  background: lightgreen;
  transition: 2s;
}

.noMagic.wrap::before{
  content: 'А ты молодец!';
  display: flex;
  justify-content: center;
  align-items: center;
  animation: move 1s forwards;
}

@keyFrames move{
  100% {
    height: 100%;
  }
}

border: 1px solid #000;
margin:-1px 0 0 -1px;

.item{
  width: 200px;
  height: 200px;
  box-shadow: 
    1px 0 0 0 #000, 
    0 1px 0 0 #000, 
    1px 1px 0 0 #000,
    1px 0 0 0 #000 inset, 
    0 1px 0 0 #000 inset;
}