body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f0f0f0;
}

header {
  background-color: #333;
  color: #fff;
  text-align: center;
  padding: 1em 0;
}

#gallery {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  padding: 2em;
}

.project {
  width: 300px;
  margin: 1em;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.project img {
  width: 100%;
  height: auto;
  max-width: 100%;
  max-height: 100%;
}

#overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
}

#overlay-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

#overlay-image {
  max-width: 90%;
  max-height: 90%;
}

#close-btn {
  position: absolute;
  top: 10px;
  right: 15px;
  font-size: 30px;
  color: #fff;
  cursor: pointer;
}