.exercise {
  margin-bottom: 20px;
}

.highlight {
  background-color: yellow;
}

.box {
  width: 100px;
  height: 100px;
  background-color: lightblue;
  margin: 10px;
}

.shift {
  margin-top: 50px;
}

.container {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
}

.box-2 {
  width: 30%;
  height: 100px;
  background-color: lightblue;
  margin: 10px;
  transition: width 0.5s;
}

.dynamic-content {
  width: 100%;
  height: 50px;
  background-color: lightcoral;
  margin: 10px 0;
}

@media (max-width: 600px) {
  .box-2 {
    width: 100%;
  }
}

.box-3 {
  width: 30%;
  height: 100px;
  background-color: lightblue;
  margin: 10px;
  transition: transform 0.5s, width 0.5s;
}

.box-3:hover {
  transform: translateX(50px);
}

.large-box {
  width: 100%;
  height: 300px;
  background-color: lightcoral;
  margin: 10px 0;
}

.overlap {
  position: absolute;
  top: 50px;
  left: 50px;
  width: 200px;
  height: 200px;
  background-color: lightgreen;
  opacity: 0.5;
}

.composite {
  width: 100px;
  height: 100px;
  background-color: lightblue;
  margin: 10px;
  transform: translateZ(0);
}

.paint {
  width: 100px;
  height: 100px;
  background-color: lightblue;
  margin: 10px;
}

.paint:hover {
  background-color: lightgreen;
}

.message {
  font-family: Arial, sans-serif;
  font-size: 20px;
  color: #333;
  padding: 20px;
  border: 2px solid #ccc;
  border-radius: 5px;
  background-color: #f9f9f9;
  max-width: 600px;
  margin: 50px auto;
  text-align: center;
}

.content {
  height: 2000px;
  background: linear-gradient(to bottom, #f06, white);
  font-family: Arial, sans-serif;
  padding: 20px;
}

@font-face {
  font-family: 'CustomFont';
  src: local('CustomFont'),
    url('https://example.com/fonts/CustomFont.ttf') format('truetype') url('https://example.com/fonts/CustomFont.woff2') format('woff2'),
    url('https://example.com/fonts/CustomFont.woff') format('woff');
  font-weight: normal;
  font-style: normal;
}

.custom-font {
  font-family: 'CustomFont', Arial, sans-serif;
  font-size: 24px;
  color: #333;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
  body {
    background-color: white;
    color: black;
  }
}

@media (prefers-color-scheme: light) {
  body {
    background-color: greenyellow;
    color: red;
  }
}

.screen-only {
  display: block;
}

.print-only {
  display: none;
}

/* Print styles */
@media print {
  body {
    background-color: lightblue;
    color: black;
  }

  .screen-only {
    display: none;
  }

  .print-only {
    display: block;
  }
}

.normal-contrast {
  display: block;
}

.high-contrast {
  display: none;
}

/* High contrast styles */
@media (prefers-contrast: high) {
  body {
    background-color: black;
    color: yellow;
  }

  .normal-contrast {
    display: none;
  }

  .high-contrast {
    display: block;
  }
}