| HTML Class | Value | Description |
| back-col-red | background-color: red; | Change the Background color to Red |
| back-col-green | background-color: green; | Change the Background color to green |
| back-col-black | background-color: black; | Change the Background color to black |
| back-col-blue | background-color: blue; | Change the Background color to blue |
| back-col-yellow | background-color: yellow; | Change the Background color to yellow |
| back-col-d-green | background-color: darkgreen; | Change the Background color to darkgreen |
| back-col-d-red | background-color: darkred; | Change the Background color to darkred |
| back-col-d-blue | background-color: darkblue; | Change the Background color to darkblue |
| back-col-orange | background-color: orange; | Change the Background color to orange |
| back-col-l-green | background-color: lightgreen; | Change the Background color to lightgreen |
| back-col-l-blue | background-color: lightblue; | Change the Background color to lightblue |
| back-col-white | background-color: white; | Change the Background color to white |
| back-col-gray | background-color: gray; | Change the Background color to gray |