style.css

.inter-body {
    font-family: "Inter", system-ui;
    font-optical-sizing: auto;
    font-weight: 500;
    font-style: normal;
}

.bottom-cirno {
    position:fixed;
    bottom:0px;
    left:75%;
}

/* from https://github.com/picocss/pico/discussions/482#discussioncomment-9043725 - thanks! */
:root {
    --pico-font-family-sans-serif: Inter, system-ui, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, Helvetica, Arial, "Helvetica Neue", sans-serif, var(--pico-font-family-emoji);
    --pico-font-size: 90%;
    /* Original: 100% */
    --pico-line-height: 1.25;
    /* Original: 1.5 */
    --pico-form-element-spacing-vertical: 0.75rem;
    /* Original: 1rem */
    --pico-form-element-spacing-horizontal: 1.0rem;
    /* Original: 1.25rem */
    --pico-border-radius: 0.375rem;
    /* Original: 0.25rem */
}

@media (min-width: 576px) {
    :root {
        --pico-font-size: 90%%;
        /* Original: 106.25% */
    }
}

@media (min-width: 768px) {
    :root {
        --pico-font-size: 90%%;
        /* Original: 112.5% */
    }
}

@media (min-width: 1024px) {
    :root {
        --pico-font-size: 90%%;
        /* Original: 118.75% */
    }
}

@media (min-width: 1280px) {
    :root {
        --pico-font-size: 90%%;
        /* Original: 125% */
    }
}

@media (min-width: 1536px) {
    :root {
        --pico-font-size: 90%%;
        /* Original: 131.25% */
    }
}

h1,
h2,
h3,
h4,
h5,
h6 {
    --pico-font-weight: 600;
    /* Original: 700 */
}

article {
    border: 1px solid var(--pico-muted-border-color);
    /* Original doesn't have a border */
    border-radius: calc(var(--pico-border-radius) * 2);
    /* Original: var(--pico-border-radius) */
}

article>footer {
    border-radius: calc(var(--pico-border-radius) * 2);
    /* Original: var(--pico-border-radius) */
}