De links:

Iframe: 

<iframe

        src="https://widget.thefork.com/17644bb7-52fc-4418-9999-ff7d88dcf7df"

        style="width: 100%; min-height:800px; border:none; overflow:scroll;"

      ></iframe>

Button:

<div class="tf-widget-button"><a class="tf-button-link" href="https://widget.thefork.com/17644bb7-52fc-4418-9999-ff7d88dcf7df" target="_blank" rel="noopener">Make a reservation</a></div><style>.tf-widget-button{opacity:1;-webkit-box-align:center;-ms-flex-align:center;align-items:center;border:1px solid;z-index:9999999;background-color:#fff;border-radius:4px;display:-webkit-box;display:-ms-flexbox;display:flex;height:42px;width:220px;border-color:hsl(174, 100%, 20%);color:hsl(174, 100%, 20%)}.tf-button-link{text-decoration:none;color:hsl(174, 100%, 20%);font-family:Raleway,sans-serif;font-size:1.1em;width:100%;text-align:center}.tf-button-link:hover{font-weight:700;background:none!important}</style>

 

Link:

https://widget.thefork.com/17644bb7-52fc-4418-9999-ff7d88dcf7df