Slider Height Images

I have an image slider with thumbnails and am having a bit of a problem. When you click on the thumbnail of the last image, the thumbnails below as well as the arrows in the carous

Solution 1:

iframe by default is an inline element

add style

display:block; 

for

#sketchfab-iframe.active {
    opacity: 1;
    position: relative;
    display: block;**
}

Codepen

Read more on https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element