Button SUBMIT color

Hi,
I have created a Contact Form 7 that works very well. I am receiving the messages sent to me correctly.
My problem is with the SUBMIT button.
Normally, when a person completes the form and clicks on the SUBMIT button, next to this button you see a small circle that rotates to indicate that the form is being sent.
I don’t see this little circle anymore, which is annoying because people sometimes click several times because they think that the form has not been sent… whereas I received it.
How can I make this little circle reappear to show that the form is being sent?
Here is the HTML code that I filled in on my form for the SUBMIT button:

<div style=”text-align: center;”>
<input type=”submit” class=”button” value=”SEND”<div style=”background: red; color: white; border: 1px solid black;”></div>

Maybe I need to use a different HTML code to send the form, knowing that I want the SUBMIT button to be red (by default on the theme it is blue).

And when I don’t fill in the color and it stays with the default color of the AERA theme, the little circle allowing to see that the form is being sent is well present.

Thank you