`css
body {
  font-family: Arial, sans-serif;
  background-color: #e2e8f0;
  text-align: center;
}

.container {
  max-width: 520px;
  margin: 30px auto;
  padding: 24px;
  background: #fff;
  box-shadow: 0 2px 16px rgba(0,0,0,0.2);
  border-radius: 9px;
}

h1 {
  font-size: 2em;
  margin-bottom: 20px;
  color: #222;
}

.image-container {
  margin-bottom: 20px;
}

img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.controls {
  text-align: left;
  margin-top: 10px;
}

label {
  font-weight: bold;
  margin: 1.2em 0 .3em;
  display: block;
  color: #334155;
}

input[type="range"] {
  width: 100%;
  margin-bottom: .7em;
}

button {
  background: #257cff;
  color: white;
  border: none;
  padding: 0.7em 1.5em;
  margin-top: 12px;
  margin-right: 10px;
  border-radius: 6px;
  transition: background .2s;
  cursor: pointer;
}

button:hover {
  background: #1e62c4;
}