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All visual styles live in style.css. Edit that file directly to change any of the values described below.

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Background

The body uses a white base color with three radial gradients that produce a subtle sky-blue tint in the corners and top center.
style.css
body {
    background-color: #ffffff;
    background-image:
        radial-gradient(at 0% 0%, hsla(210,100%,98%,1) 0, transparent 50%),
        radial-gradient(at 50% 0%, hsla(220,100%,97%,1) 0, transparent 50%),
        radial-gradient(at 100% 0%, hsla(210,100%,98%,1) 0, transparent 50%);
}
To change the base color, update background-color. To shift the tint, adjust the hue values in the hsla() functions. The first argument is the hue (0–360): 210 and 220 are blue tones.
To create a warmer, sunrise-style background, try hues around 30–45 (orange/amber) or 270–290 (purple/violet).
Example — soft warm tint:
style.css
body {
    background-color: #fffdf8;
    background-image:
        radial-gradient(at 0% 0%, hsla(40,100%,98%,1) 0, transparent 50%),
        radial-gradient(at 50% 0%, hsla(35,100%,97%,1) 0, transparent 50%),
        radial-gradient(at 100% 0%, hsla(40,100%,98%,1) 0, transparent 50%);
}

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Card / container

The .container class controls the white card that centers the app’s content.
style.css
.container {
    background: #ffffff;
    padding: 3rem;
    border-radius: 24px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.04), 0 2px 10px rgba(0, 0, 0, 0.02);
    border: 1px solid #f0f0f0;
    text-align: center;
    width: 350px;
}
Make the card wider — increase width:
style.css
.container {
    width: 480px;
}
Add a dark mode variant — use a prefers-color-scheme media query:
style.css
@media (prefers-color-scheme: dark) {
    body {
        background-color: #0d0d0d;
        background-image:
            radial-gradient(at 0% 0%, hsla(210,50%,10%,1) 0, transparent 50%),
            radial-gradient(at 50% 0%, hsla(220,50%,8%,1) 0, transparent 50%),
            radial-gradient(at 100% 0%, hsla(210,50%,10%,1) 0, transparent 50%);
    }

    .container {
        background: #1a1a1a;
        border-color: #2a2a2a;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3), 0 2px 10px rgba(0, 0, 0, 0.2);
    }
}
border-radius: 24px gives the card its rounded corners. Set it to 0 for sharp corners or 12px for a subtler rounding.

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Typography

The app uses the Inter typeface with a system font fallback:
style.css
body {
    font-family: 'Inter', -apple-system, sans-serif;
}
To swap in a different font, load it from Google Fonts in index.html and update the font-family value in style.css.
1

Add the Google Fonts link to index.html

Place the <link> tag inside <head>, before the stylesheet:
index.html
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;700&display=swap" rel="stylesheet">
2

Update font-family in style.css

style.css
body {
    font-family: 'DM Sans', -apple-system, sans-serif;
}
Keep -apple-system, sans-serif as a fallback so the app still renders cleanly if the web font fails to load.

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Button colors

The “Check Weather” button and the forecast tab buttons (#getWeather, .tab-btn) are styled in style.css. Find those selectors in the file and update the background-color, color, and border properties to match your preferred palette.
The primary blue used throughout the app is #007bff. Keeping your button color consistent with this value maintains visual cohesion with the icon and accent colors.

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Animation speed

The sun and rain icons follow an arc path above the logo using the weatherArcPath keyframe animation. The animation property is set on .sun-icon, .rain-icon:
style.css
.sun-icon, .rain-icon {
    animation: weatherArcPath 6s linear infinite;
}
The second value (6s) is the duration. Decrease it to speed up the arc, or increase it to slow it down. 
.sun-icon, .rain-icon {
    animation: weatherArcPath 3s linear infinite;
}
Setting the duration below 1s can cause the animation to feel janky on lower-end devices. Values between 3s and 10s tend to look best.

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