Guide
Fluid Type Installation
Drop Fluid Type CSS into Custom CSS and tune the scale.
Prerequisites
A Squarespace 7.1 site with access to Site Styles → Custom CSS (any paid plan).
Install Fluid Type
Fluid Type is a CSS pack. You paste it once, then tweak the variables if you want a tighter or larger scale.
1. Open Custom CSS
In Squarespace, go to Website → Website Tools → Custom CSS (or Site Styles → Custom CSS, depending on your UI).
2. Paste the pack
Copy the full snippet below into Custom CSS and save.
:root {
--ft-h1-min: 2.25rem;
--ft-h1-max: 4.5rem;
--ft-h2-min: 1.75rem;
--ft-h2-max: 3rem;
--ft-h3-min: 1.35rem;
--ft-h3-max: 2rem;
--ft-body-min: 1rem;
--ft-body-max: 1.125rem;
}
h1, .sqsrte-large {
font-size: clamp(var(--ft-h1-min), 4vw, var(--ft-h1-max)) !important;
line-height: 1.05;
letter-spacing: -0.02em;
}
h2 {
font-size: clamp(var(--ft-h2-min), 3vw, var(--ft-h2-max)) !important;
line-height: 1.1;
}
h3 {
font-size: clamp(var(--ft-h3-min), 2.4vw, var(--ft-h3-max)) !important;
line-height: 1.2;
}
p, .sqsrte-text {
font-size: clamp(var(--ft-body-min), 1.2vw, var(--ft-body-max));
line-height: 1.6;
}
3. Tune the scale
Edit the --ft-*-min and --ft-*-max variables at the top. Min controls phones; max controls large desktops. Keep the ratio gentle so type stays editorial, not shouty.
4. Check mobile
Preview on a phone width. If a heading feels huge on mobile, lower the matching -min value by 0.15rem and re-check.