Hello, biotxakur!
I have translated the “Read more” text on the color box for you, by adding the next custom CSS code:
/*Color Box "Read more" translation*/
.tv_color_box div a{
text-indent: -999px;
}
.tv_color_box div a:before{
text-indent: 0px;
float: left;
content: 'Lee mas';}
https://prnt.sc/o1pyd2
Change the “Lee mas” text to whatever you want.
As for the size of the color boxes,
Maybe you should try to change the Row layout and row settings there is a lot of options.
https://prnt.sc/o1q1g1
https://wpbakery.com/video-academy/category/row/
Regards