HTML/CSS is bugging

Hello,

I really like your plugin and use it frequently.

However, I'm experiencing an issue with CSS code.

When I use the following code in my Github .md file:

<style>
    h1 {
        color: red;
    }
</style>

Only this part seems to be applied:


h1 {
    color: red;
}

I have no idea where the <style> tag has gone.