Incorporating the bootstrap cards (shown in the image below) has been successful. However, an issue arises when adding a sidebar and nav bar (included as another file using PHP). The cards on the left side of the screen end up being hidden under the sidebar. Applying the CSS code below adds a 200px margin to each card, but that is not the desired outcome. What is needed is for only the cards on the left to shift towards the left while maintaining the same gap between each card. Attempts with frames have proved unsuccessful.
.cards{
margin-left:200px;
}