* { box-sizing: border-box; }
body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  overflow-x: hidden;
  color: #fff;
  background: repeating-linear-gradient(90deg, #004d98 0 70px, #a50044 70px 140px);
  font-family: "Comic Sans MS", "Comic Sans", cursive;
}
body::before {
  content: "30";
  position: fixed;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%) rotate(-8deg);
  color: rgb(255 237 0 / 18%);
  font: 900 min(75vw, 55rem)/1 Arial, sans-serif;
  pointer-events: none;
}
.confetti {
  position: fixed;
  top: 1rem;
  width: 100%;
  text-align: center;
  font-size: clamp(1.5rem, 5vw, 3rem);
  letter-spacing: .35em;
  animation: bounce 1s infinite alternate;
}
main {
  position: relative;
  width: min(92vw, 760px);
  margin: 6rem 0 5rem;
  padding: 2.5rem 2rem;
  text-align: center;
  background: #111;
  border: 10px ridge #ffed00;
  box-shadow: 18px 18px 0 #ffed00;
  transform: rotate(-1deg);
}
.badge {
  display: inline-block;
  padding: .5rem .9rem;
  color: #111;
  background: #ffed00;
  font-weight: 900;
  letter-spacing: .08em;
  transform: rotate(2deg);
}
h1 {
  margin: 1.2rem 0 .4rem;
  font-size: clamp(2.6rem, 9vw, 5.5rem);
  line-height: .95;
  text-shadow: 4px 4px 0 #004d98, 8px 8px 0 #a50044;
}
.age {
  margin: .5rem 0 1rem;
  color: #ffed00;
  font: 900 clamp(2rem, 8vw, 4.5rem)/1 Arial, sans-serif;
}
section {
  margin: 1.5rem auto;
  padding: 1.2rem;
  color: #111;
  background: #fff;
  border: 6px dashed #a50044;
  transform: rotate(1deg);
}
section span, section strong, section em { display: block; }
section span { color: #a50044; font-weight: 900; }
section strong { margin: .5rem 0; font-size: clamp(1.7rem, 6vw, 3.2rem); line-height: 1; }
section em { color: #004d98; font-size: 1.4rem; font-weight: 700; }
button {
  padding: 1rem 1.4rem;
  border: 5px outset #fff;
  color: #111;
  background: #ffed00;
  font: 900 1rem inherit;
  cursor: pointer;
}
button:active { border-style: inset; }
footer {
  position: fixed;
  bottom: .75rem;
  padding: .4rem .8rem;
  color: #111;
  background: #ffed00;
  font-weight: 700;
}
@keyframes bounce { to { transform: translateY(.5rem) rotate(2deg); } }
@media (max-width: 520px) {
  main { margin-top: 5rem; padding: 2rem 1rem; box-shadow: 10px 10px 0 #ffed00; }
  footer { position: static; margin: 1rem; text-align: center; }
}