Next button appear at the same time with Check answer

@yanou – I took a look at your theme’s stylesheet and it looks like the problem is in the declaration starting on line 75 which applies display: inline-block !important; to theses elements a.button, .button

It is the !important part that is breaking things, because this tells the browser to use that style above all others. In the case of the “Next” button, it needs to display: none; until we want it to appear; so the display: inline-block !important; is overriding this.

I would suggest removing that !important directive and taking a look at your site to see if removing that broke anything elsewhere. In any case, remove that should fix the quiz buttons.