Bootstrap 4 row fill remaining height

Use the Bootstrap 4.1 flex-grow-1 class…

https://codeply.com/go/Iyjsd8djnz

html,body{height:100%;}

.bg-purple {
  background: rgb(48,0,50);
}
.bg-gray {
  background: rgb(74,74,74);
}
.bg-blue {
  background: rgb(50,101,196);
}
.bg-red {
  background: rgb(196,50,53);
}
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

<div class="container-fluid h-100">
  <div class="row justify-content-center h-100">
    <div class="col-4 bg-red">
      <div class="h-100 d-flex flex-column">
        <div class="row justify-content-center bg-purple">
          <div class="text-white">
            <div style="height:150px">ROW 1 - fixed height</div>
          </div>
        </div>
        <div class="row justify-content-center bg-blue flex-grow-1">
          <div class="text-white">ROW 2 - grow remaining height</div>
        </div>
      </div>
    </div>
    <div class="col-8 bg-gray"></div>
  </div>
</div>

Update 4.3.1: Another example using the vh-100 utility class

https://codeply.com/go/h3bZbM6eSS

.bg-purple {
  background: rgb(48,0,50);
}
.bg-gray {
  background: rgb(74,74,74);
}
.bg-blue {
  background: rgb(50,101,196);
}
.bg-red {
  background: rgb(196,50,53);
}
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

<div class="container-fluid">
  <div class="row justify-content-center min-vh-100">
    <div class="col-4 bg-red">
      <div class="d-flex flex-column h-100">
        <div class="row justify-content-center bg-purple">
          <div class="text-white">
            <div style="height:150px">ROW 1 - fixed height</div>
          </div>
        </div>
        <div class="row justify-content-center bg-blue flex-grow-1">
          <div class="text-white">ROW 2 - grow remaining height</div>
        </div>
      </div>
    </div>
    <div class="col-8 bg-gray"></div>
  </div>
</div>

Related: How to make the row stretch remaining height

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