Different style for two forms

Hi there,

I can’t find out how I can style with css a second form on a website in a different style. I already tried with the form id. As an example:
But this does not work. I also tried to find out how to add a html class to the shortcode, but could not find out.

Can anyone help out how to target a specific form when there are more than one??
Thanks in advance

`#wpcf7-f83-p84-o1 ::-webkit-input-placeholder {
font-size: 22px;
color: #00C2E5;
font-family: ‘Poppins’;

}
#wpcf7-f83-p84-o1 :-moz-placeholder { /* older Firefox*/
font-size: 22px;
color: #00C2E5;
font-family: ‘Poppins’;

}
#wpcf7-f83-p84-o1 ::-moz-placeholder { /* Firefox 19+ */
font-size: 22px;
color: #00C2E5;
font-family: ‘Poppins’;

}
#wpcf7-f83-p84-o1 :-ms-input-placeholder {
font-size: 22px;
color: #00C2E5;
font-family: ‘Poppins’;

}