<div class="container2">
  <div class="row2">
    <div class="col2"></div>
  </div>
</div>

<div class="container">
  <div class="row">
    <div class="col"></div>
    <div class="col"></div>
    <div class="col"></div>
    <div class="col"></div>
    <div class="col"></div>
    <div class="col"></div>
    <div class="col"></div>
    <div class="col"></div>
    <div class="col"></div>
    <div class="col"></div>
    <div class="col"></div>
    <div class="col"></div>
  </div>
</div>

body {
  margin: 0px;
}

* {
  box-sizing: border-box;
}

.container {
  position: fixed;
  top: 0px;
  left: 0px;
  width: 100%;
  padding: 0px 30px;
}

.container2 {
  padding: 0px 30px;
}

.row, .row2 {
  max-width: 960px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-gap: 20px;
}

.col {
  height: 100vh;
  background-color: rgba(255, 0, 0, 0.1);
}

.col2 {
  height: 100vh;
  background-color: rgba(0, 0, 255, 0.2);
  grid-column: 3/5;
}