Rounded Border

Hi,
with the old version and with this css code:
.wpmslider-viewport {
border: 1px solid # 0000FF;
border-radius: 15px;
}

I put the display rounded but with the new version it leaves me a white space at the top.
http://nsa39.casimages.com/img/2018/02/23/18022309150436710.png

How to modify this?
Thanks in advance
Fred

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