Ah I see. Thank you for the information!

I added this code in Quick CSS, Enfold:

.avia_textblock.awesome-textblock p {
background:rgba(255,255,255,0.5);
padding: 10px;
font-size: 11px;
}

But the problem was, every time I pressed enter in Text Block (Visual), it will create another box. I tried to use <br />, it works. But only 1 <br />, if I used 2 <br />, it will create another box. I just want a space between paragraph in 1 box.

Thank you Josue :)