Uppercase and Lowercase placeholder / text

Hi,
I would like to know if this is possible.

In my form I need the input of the field to be in UPPERCASE. But I want the placeholder itself to stay “Normal” / inherit.

I have tried this code but one keeps replacing the other.

.wpcf7 input[name=”Postcode”]
{
text-transform: uppercase;
}
.wpcf7 input[placeholder=”Postcode*”]
{
text-transform: inherit

}

I have linked images how I want it to look from a different webiste

(before) – https://ibb.co/qJd8grp

(after) – https://ibb.co/1Q6SPCW

Is this possible with CF7?

Thanks