How to add a twitter card and intent to Carrd.co

Carrd.co: add a Twitter Intent icon using Embed Control in the footer

<div class="footer">
<a href="https://twitter.com/intent/tweet?text=Your text that will be the tweet text. &url=https://your-website.carrd.co" >
<svg><use xlink:href="#icon-905">
<symbol id="icon-905" viewBox="0 0 40 40"><path d="M36.3,10.2c-1,1.3-2.1,2.5-3.4,3.5c0,0.2,0,0.4,0,1c0,1.7-0.2,3.6-0.9,5.3c-0.6,1.7-1.2,3.5-2.4,5.1 c-1.1,1.5-2.3,3.1-3.7,4.3c-1.4,1.2-3.3,2.3-5.3,3c-2.1,0.8-4.2,1.2-6.6,1.2c-3.6,0-7-1-10.2-3c0.4,0,1.1,0.1,1.5,0.1 c3.1,0,5.9-1,8.2-2.9c-1.4,0-2.7-0.4-3.8-1.3c-1.2-1-1.9-2-2.2-3.3c0.4,0.1,1,0.1,1.2,0.1c0.6,0,1.2-0.1,1.7-0.2 c-1.4-0.3-2.7-1.1-3.7-2.3s-1.4-2.6-1.4-4.2v-0.1c1,0.6,2,0.9,3,0.9c-1-0.6-1.5-1.3-2.2-2.4c-0.6-1-0.9-2.1-0.9-3.3s0.3-2.3,1-3.4 c1.5,2.1,3.6,3.6,6,4.9s4.9,2,7.6,2.1c-0.1-0.6-0.1-1.1-0.1-1.4c0-1.8,0.8-3.5,2-4.7c1.2-1.2,2.9-2,4.7-2c2,0,3.6,0.8,4.8,2.1 c1.4-0.3,2.9-0.9,4.2-1.5c-0.4,1.5-1.4,2.7-2.9,3.6C33.8,11.2,35.1,10.9,36.3,10.2L36.3,10.2z"></path></symbol> 
</use></svg></a></div>

Embed control on 1st page - twitter card + css

<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:creator" content="@yourtwitteraccount">
<meta name="twitter:title" content="your website name">
<meta name="twitter:description" content="Your description that will appear below the picture on the card.">
<meta name="twitter:image" content="https://your-website.carrd.co/assets/images/image05.png?v34475746477951"> 
<style>
.footer {
 font-size: 1em;
 margin-left: -0.375rem;
}

.footer a svg {
 color:#B3B3B3!important;
 fill:#B3B3B3!important;
 height:2em!important;
 width:2em!important;
}
</style>

This will make your website twitter friendly by

1. Specifying the image and words displayed on the twitter card when someone includes your URI in their tweet;
2. It also adds a Twitter intent button, which means when they click it they get a ready made tweet they can post from their own twitter account. The styling makes the SVG image small and grey suitable for a footer. Tweek the css to suit yours.

This assumes you have the Pro standard plan or higher.

The twitter card style needs to be hidden, in the header;
The Twitter intent button needs to be inline style.