How to change the slide image display?

I mean the translucent box that show the title and description.

1) I want to change the the size from 300 to 250 px.
2) I wanna move some of them, say to the right bottom.
3) Can I remove the colored line at the right edge?

Thank you!

 

I tried to change the size by simply editting the css code in styling options, but it didn't work.

.slide .slide-content.entry
{ width: 250px; left: 0px; bottom: 40px; padding: 10px 20px; position: absolute; font-size: 13px; }

 

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

.slide .slide-content.entry {
border: none!important;
right:0px;
width:250px!important;
}

 

Thank you!