Text Larger Form Field?

Site URL: https://smilodon-ocelot-my5f.squarespace.com/contact

Hi,

How do I make these words larger on desktop view?

Also, is there also a way of changing them to say "FIRST" and "LAST" and remove the word "NAME"?

passcode: trythis

Add to Home > Design > Custom CSS

legend.title {
    display: none !important;
}
.field.first-name .caption-text {
    visibility: hidden;
}
.field.first-name .caption-text:before {
    visibility: visible;
    content: "FIRST";
}
.field.last-name .caption-text {
    visibility: hidden;
}
.field.last-name .caption-text:before {
    visibility: visible;
    content: "LAST";
}

Thank you!