main.css

/* defining variable font roman */
@font-face {
    font-family: 'PlexSansVar';
    src: url('fonts/IBMPlexSansVar-Roman.woff2') format('woff2-variations'),
        url('fonts/IBMPlexSans-Text.woff2') format('woff2');
    font-weight: 125 950;
    font-stretch: 75% 125%;
    font-style: normal;
}
/* defining variable font italic, yes the same font-family */
@font-face {
    font-family: 'PlexSansVar';
    src: url('fonts/IBMPlexSansVar-Italic.woff2') format('woff2-variations'),
        url('fonts/IBMPlexSans-Italic.woff2') formart('woff2');
    font-weight: 50 950;
    font-stretch: 75% 125%;
    font-style: italic;
}
/* fallback to browsers that don't support variable fonts and need bold */
@font-face {
    font-family: 'PlexSansVar';
    src: url('fonts/IBMPlexSansVar-Roman.woff2') format('woff2-variations'),
        url('fonts/IBMPlexSans-Bold.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
}

:root {
    --border-radius: 6px; 
    --card-height: 12.5vw;
    --card-width: 13vw;
    --theme-editor-width: 20vw;
    --margin-top: 3vw;
}

html {
    font-size: 14px;
}
@media screen and (min-width: 320px) {
    html {
        font-size: 16px;
    }
}
@media screen and (min-width: 1000px) {
    html {
        font-size: 22px;
    }
}

body {
    font-family: 'PlexSansVar', system-ui, -apple-system;
    margin: 2vw;
    background-color: #252526;
    color: white;
}

a:active {
    color: white;
}
a:visited {
    color: white;
}
a:link {
    color: white;
}

h1 {
    font-size: 2.5rem;
    font-variation-settings: 'wght' 200;
    margin-top: 0;
    margin-bottom: 0;
}

h2 {
    font-size: 2rem;
    font-variation-settings: 'wght' 100;
    margin-top: 0;
    margin-bottom: 0;
}

h3 {
    font-size: 1rem;
    font-variation-settings: 'wght' 200;
    margin-top: .5ex;
    margin-bottom: 1ex;
}

span {
    font-size: .7rem;
    font-variation-settings: 'wght' 100;
    margin-top: .5ex;
    margin-bottom: 1ex;
}

summary {
    font-style: italic;
    font-size: .7rem;
    font-variation-settings: 'wght' 300;
}