CSS Quick Reference

p { }

.card { }

#header { }

.nav a { }

.nav > a { }

h1, h2, h3 { }

[type="email"] { }

a[href^="https"] { }

a:hover { }

button:focus-visible { }

input:disabled { }

li:first-child { }

li:nth-child(2n) { }

li:last-child { }

li:not(.done) { }

.card:has(img) { }

.required::after { content: "*"; }

*, *::before, *::after { box-sizing: border-box; }

padding: 16px;

padding: 8px 16px;

margin: 0 auto;  /* center a block */

max-width: 60rem;

min-height: 100vh;

border: 1px solid #ddd;

border-radius: 8px;

box-shadow: 0 2px 8px rgb(0 0 0 / 0.15);

overflow: hidden;

overflow-y: auto;

aspect-ratio: 16 / 9;

.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.center {
  display: grid;
  place-items: center;
}

flex-wrap: wrap;

flex: 1;

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

grid-column: span 2;

.parent { position: relative; }

.badge { position: absolute; top: 0; right: 0; }

position: sticky;
top: 0;

z-index: 10;

font-family: system-ui, sans-serif;

font-size: 1.125rem;

font-weight: 600;

line-height: 1.6;

letter-spacing: 0.02em;

text-align: center;

text-transform: uppercase;

white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;

text-wrap: balance;

color: #2563eb;

background: rgb(37 99 235 / 0.1);

color: oklch(60% 0.2 260);

background: linear-gradient(135deg, #2563eb, #9333ea);

@import url("https://fonts.googleapis.com/css2?family=Inter&display=swap");

@media (min-width: 768px) {
  .sidebar { display: block; }
}

@media (prefers-color-scheme: dark) {
  body { background: #111; color: #eee; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none; transition: none; }
}

font-size: clamp(1rem, 2.5vw, 2rem);

.cards { container-type: inline-size; }
@container (min-width: 500px) {
  .card { display: flex; }
}

img { max-width: 100%; height: auto; }

:root { --brand: #2563eb; }
.button { background: var(--brand); }

color: var(--text, #111);

transition: transform 200ms ease, opacity 200ms ease;

transform: translateY(-4px);

transform: rotate(45deg) scale(1.1);

@keyframes spin {
  to { transform: rotate(360deg); }
}
.loader { animation: spin 1s linear infinite; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.card {
  padding: 1rem;
  & h2 { margin: 0; }
  &:hover { box-shadow: 0 2px 8px #0002; }
}