How to change the pulse color ?

[Yohandah]

I'm submitting a ... (check one with "x")

• [ ] bug report => search github for a similar issue or PR before submitting
• [x ] feature request

Current behavior

If I'm setting a white background

[theme]="{
            'border-radius': '5px',
            height: '50px',
            'background-color': 'white',
            border: '1px solid #b3c0cb'
          }"

The pulse cannot be seen, I would like to change its color but can we ? It's setted right there but can we access it with [theme] ?