body {
  background: #f5f5f5;
  font-family: 'Inter', Arial, sans-serif;
}
#slide-container {
  max-width: 75%;
  min-height: 500px;
  margin: 60px auto 40px auto;
  background: #fff;
  border: 4px solid #222;
  box-shadow: 12px 12px 0 #222;
  padding: 40px 48px;
  border-radius: 0;
}
.slide-title-block {
  text-align: center;
  margin-bottom: 24px;
  background: #ffe600;
  border: 3px solid #222;
  box-shadow: 4px 4px 0 #222;
}
#slide-container h2 {
  font-size: 2.5rem;
  letter-spacing: 1px;
  color: #222;
}
#slide-container h3 {
  font-size: 2rem;
  margin: 1em;
  background:rgba(128, 130, 255, 0.479);
}
#slide-container h4 {
  font-size: 1.5rem;
  color: #222;
  margin: unset;
  background:rgb(128, 255, 160);
  margin: 1em;
}
#slide-container ul li {
  padding: .25em;
  font-size: 22px;
}
.neo-btn {
  background: #fff;
  border: 3px solid #222;
  color: #222;
  font-weight: bold;
  font-size: 1.5rem;
  padding: 12px 32px;
  margin: 0 16px;
  box-shadow: 4px 4px 0 #222;
  border-radius: 0;
  cursor: pointer;
  transition: background 0.2s;
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
}
#prev-slide { left: 20px; }
#next-slide { right: 20px; }