Header Image Won’t Resize

Hello,

I have been trying to resize my header image on my site. I want it to be a bit smaller.

I tried putting this code into my Custom Simple CSS:
.inside-header {
padding-top: 20px;
padding-bottom: 10px;
}
It does nothing.

I also tried this code:
.frontpage-banner > img {
height: 100px;
width: 50%; }
It does nothing

I also tried this code:
#header-text-nav-wrap {
padding: 0;
}
It does nothing.

Nothing will change the size of the header image. Do I have any other options?
Thank you in advance,
D.D.

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