I'm currently in the process of learning Bootstrap and I'm still fairly new, so please go easy on me. I'm trying to make a page where there is a main heading for the page, a heading above the grids, and 3 unequal responsive grids than span the height of the rest of the page, even when the browser is resized. I've tried setting height or row and each div to 100%, I also tried looking this up but I didn't find anything of much use, and I'm not sure how I would achieve this, Thanks for taking the time to help. Code is:
EDIT: To specify, my issue is getting the remaining area to take up 100% of space, not a div taking up 100% of the page, just the remaining part
.div1 {
background-color:red;
}
.div2 {
background-color:gray;
}
.div3 {
background-color:blue;
}
.row {
height: 100%;
}
#main {
background-color: yellow;
}
<!DOCTYPE html>
<html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
</head>
<body>
<link rel="stylesheet" href="test.css">
<script src="test.js"></script>
<h1>Welcome</h1>
<div class="container-fluid" id="main">
<h1>This is a heading</h1>
<div class="row">
<div class="col-sm-3 div1">Left side</div>
<div class="col-sm-6 div2">Middle</div>
<div class="col-sm-3 div3">Right side</div>
</div>
</div>
</body>
</html>