Given the HTML markup:
<button class="checkout-btn">
checkout
</button>Without changing the HTML, make the button look reasonably similar to the screenshot below. It doesn't have to have pixel-perfect measurements. Feel free to use Google. Try not to spend more than an hour on it. The colors used are: lightsteelblue, steelblue, white and darkslategray and the font is whatever sans-serif floats your boat.