<div class="container">
  <div class="main">
    <div class="card">Card</div>
    <div class="card">Card</div>
    <div class="card">Card</div>
    <div class="card">Card</div>
    <div class="card">Card</div>
    <div class="card">Card</div>
    <div class="card">Card</div>
    <div class="card">Card</div>
    <div class="card">Card</div>
    <div class="card">Card</div>
    <div class="card">Card</div>
    <div class="card">Card</div>
  </div>
  <div class="filter">
    Filter
  </div>
</div>

body {
  background: #F2F2F2;
  padding: 1rem;
}
.container {
  display: grid;
  grid-template-columns: 3fr 1fr;
  grid-gap: 1rem;
}
.main {
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 1rem;
}
.card {
  background: #fff;
  padding: 1rem;
}
.filter {
  background: #fff;
  padding: 1rem;
}