/* Reset */
* {
  box-sizing: border-box;
}

body {
  font-family: sans-serif;
  background-color: #f9f9f9;
  margin: 0;
  padding: 20px;
}

header {
  background-color: #336699;
  color: white;
  padding: 20px;
  border-radius: 10px;
  text-align: center;
  margin-bottom: 20px;
}

/* Float section */
.image-float-section {
  border: 2px solid #ccc;
  padding: 10px;
  margin-bottom: 20px;
}

.float-img {
  float: left;
  margin-right: 15px;
  border: 2px solid #444;
  padding: 5px;
}

.float-text {
  overflow: hidden;
}

/* Positioning */
.positioning-demo {
  position: relative;
  margin-bottom: 30px;
}

.relative-box {
  position: relative;
  background-color: #e0e0e0;
  border: 2px dashed #999;
  padding: 30px;
  height: 100px;
}

.absolute-box {
  position: absolute;
  top: 10px;
  right: 10px;
  background-color: #ff9999;
  padding: 5px 10px;
  border: 1px solid #cc0000;
}

/* Flexbox layout */
.flex-container {
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.flex-item {
  flex: 1;
  background-color: #d4edda;
  padding: 20px;
  text-align: center;
  border: 2px solid #155724;
  border-radius: 8px;
}

/* Footer */
footer {
  margin-top: 40px;
  text-align: center;
  color: #555;
}