Changing the size of a newletter form field box

Site URL: http://www.cure.finance/

Please the super simple page above.

I try to make the e-mail form field less prominent, smaller, less padding (and eventually the submit button as well). The squarespace settings , rulers and checkboxes don't help me. I fail to find the right css to put into the custom-css field. Actually nothing works. I can't believe that this cannot be fixed. Can somebody give me a hint or just help?

On a side note: I also try to get (only) the "CURE" in a different font (Bauhaus), but after tweating and tricking the hell out of the settings I will change it to an image like in http://www.cure.finance/home-1

Add to Home > Design > Custom CSS

div#block-5aae513f24f2f1e9e495 input {
    padding-top: 10px !important;
    padding-bottom: 5px !important;
}
@font-face {
	font-family: CURE;
	src: url(paste font file url here);
}
div#block-yui_3_17_2_1_1604352944219_3871 h1 * {
	font-family: CURE;
}

This helped. Thank you very much!!