Making easyslider corners more rounded

Dear,

i want to make the corners a little bit more rounded of my easyslider after searching i found this piece of CSS and did the job

.avia-slideshow {
    border-radius: 10px;
}

but the video that i’m running behind the slider withing the content-section get also adjusted with these rounded corners but i don’t want this.
i just want this slider one slider to have a bit more rounded corners.

Thanks in advance.