<html>
<body>
<div class="wrapper">
<div class="content"></div>
<div class="footer"></div>
</div>
</body>
</html>* {
margin: 0;
padding: 0;
}
html,
body {
height: 100%;
}
.wrapper {
display: flex;
flex-direction: column;
height: 100%;
}
.content {
flex: 1 0 auto;
}
.footer {
flex: 0 0 auto;
}<div class="row">
<div class="col-9">
<div class="row">
<div class="col-8"></div>
<div class="col-4"></div>
<div class="col-4"></div>
<div class="col-8"></div>
</div>
</div>
<div class="col-3"></div>
</div>