add this in your xml code
Adding a char field and replace it with the following code: 

Step 1: Create the nex text field & then click on "XML" (Need to be in "developer mode")

Step 2/Select the "Studio view"


3/ Replace the FULL LINE (New text block) (line 5 here) by the following (at the same space level (so, a bit further than the above "div class....."): 

Replace it with the code mentioned by Chloé (first answer of this forum entry)