<section class='container'>
<div class=''></div>
<div class=''></div>
<div class=''></div>
<div class=''></div>
</section>
<section class='grid-container'>
<div class=''></div>
<div class=''></div>
<div class=''></div>
<div class=''></div>
</section> 

div {
  background-color: green;
  height: 100px;
  width: 100px;
  border: 1px solid black
}

/* Flexbox */
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

/* CSS Grid */
.grid-container {
  display: grid;
  grid-template-columns: repeat(4, 0.1fr);
  gap: 1px;
}