You can edit the colors and effects of the shape if you click on the top menu → Format options. This way, your picture will be on top of the frame. I like to make my text box slightly larger than the text I expect to fill it. Now, click and drag on the slide to draw in your text box. Once the text-box is selected you can click and drag the dotted border to move the object. To add a totally new text box to your slide, choose the Insert > Text Box option on PowerPoint's ribbon. These can also be used to resize the object, which well cover after. Once you’ve inserted it, right click on it and select Order → Send to back. To add a new text box to your slide, choose the Insert > Text Box option. To do so, go to the top menu Insert → Shape, choose the shape that best fits your image, and insert it. You can also add a border as a shape like we did before.
If you want to delete the border, just select it and change its color to transparent in the top menu. In the same bar, you can select the style and the thickness of your frame. Now, click on each of the stops, and select a different color for each one.
Although adding text to a blank slide might be straightforward. Simply start typing in the text box and this will add the text to your slide. Drag the mouse anywhere on your slide to add the text box. Start with a single color gradient, like the one we made above. Click on the Insert ribbon and then locate and click on the Text Box icon.
You can mix different shades to the extent of a full rainbow border. Gradients don’t have to be all the same color.
Pro Tip: If you want the border to appear on every slide, you have to edit the master slide. If you want to add the border to another slide, just copy and paste it.