Design for AINewsletter signup
Newsletter signup: a CSS card. Copy the rules, or the prompt that rebuilds it.
CSS
.card-100 {
width: 340px;
padding: 26px;
background: #0f172a;
border-radius: 18px;
font-family: system-ui,sans-serif;
color: #f8fafc;
background-image: radial-gradient(circle at 100% 0,rgba(99,102,241,.35),transparent 50%)
}
.card-100 h3 {
margin: 0 0 4px;
font-size: 20px
}
.card-100 p {
margin: 0 0 16px;
font-size: 14px;
color: #94a3b8
}
.card-100__row {
display: flex;
gap: 8px
}
.card-100 input {
flex: 1;
min-width: 0;
padding: 10px 12px;
border: 1px solid #334155;
border-radius: 10px;
background: #1e293b;
color: #f8fafc;
font-size: 14px;
outline: none;
transition: border-color .15s,box-shadow .15s
}
.card-100 input::placeholder {
color: #64748b
}
.card-100 input:focus {
border-color: #818cf8;
box-shadow: 0 0 0 3px rgba(129,140,248,.25)
}
.card-100 button {
padding: 10px 16px;
border: 0;
border-radius: 10px;
background: #818cf8;
color: #0f172a;
font-size: 14px;
font-weight: 700;
cursor: pointer;
transition: background .15s
}
.card-100 button:hover {
background: #a5b4fc
}
.card-100 small {
display: block;
margin-top: 10px;
font-size: 11px;
color: #64748b
}
HTML
<form class="card-100" action="#">
<h3>Get new snippets weekly</h3>
<p>One email, ten cards, zero fluff.</p>
<div class="card-100__row"><input type="email" placeholder="[email protected]" required><button type="submit">Subscribe</button></div>
<small>Unsubscribe any time.</small>
</form>Prompt
Create a 340px newsletter signup card as a form: background #0f172a with a soft indigo radial glow in the top-right corner (rgba(99,102,241,.35) to transparent at 50%), 18px radius, 26px padding. 20px white title, 14px #94a3b8 subtitle, then a flex row: an email input on #1e293b with a 1px #334155 border and 10px radius (focus: #818cf8 border plus a 3px translucent indigo ring) next to an indigo #818cf8 "Subscribe" button with dark text that lightens to #a5b4fc on hover. An 11px #64748b "Unsubscribe any time." note below.