I'm trying to create two columns: one for my sidebar and one for the main content but rather than appearing side-by-side, one is appearing beneath the other and overlapping as I add content.
<div class="container-fluid">
        <div class="row">
            <div class="col-sm-3">
                <asp:ContentPlaceHolder ID="sideNavContents" runat="server">
                </asp:ContentPlaceHolder>
            </div>
            <div class="col-sm-9">
                <asp:ContentPlaceHolder ID="bodyContents" runat="server">
                </asp:ContentPlaceHolder>
            </div>
        </div>
</div>