* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Arial', sans-serif;
  background-color: #f2f2f2;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
}

.welcome-box {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: #ffffff;
  z-index: 9999;
}

.welcome-box h2 {
  font-size: 36px;
  margin-bottom: 20px;
}

.welcome-box p {
  font-size: 18px;
  margin-bottom: 40px;
}

.dismiss-button {
  display: inline-block;
  background-color: #ffffff;
  color: #333333;
  padding: 10px 20px;
  text-decoration: none;
  font-weight: bold;
  border-radius: 5px;
  transition: background-color 0.3s ease;
}

.dismiss-button:hover {
  background-color: #dddddd;
}

header {
  background-color: #333333;
  padding: 20px;
  border-bottom: 1px solid #dddddd;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav .logo img {
  height: 40px;
}

nav ul {
  list-style-type: none;
}

nav ul li {
  display: inline-block;
  margin-right: 20px;
}

nav ul li a {
  color: #ffffff;
  font-weight: bold;
  text-decoration: none;
}

main {
  padding: 40px;
}

section {
  margin-bottom: 40px;
}

.hero-section {
  text-align: center;
  color: #ffffff;
  padding: 80px 0;
  background-color: #000000;
}

.hero-section h1 {
  font-size: 48px;
  margin-bottom: 20px;
}

.hero-section p {
  font-size: 24px;
  margin-bottom: 40px;
}

.portfolio-section {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.portfolio-item {
  width: 300px;
  margin: 20px;
  padding: 20px;
  background-color: #ffffff;
  border-radius: 10px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.portfolio-item img {
  width: 100%;
  max-width: 200px;
  height: auto;
  margin-bottom: 20px;
}

.portfolio-item-details h3 {
  font-size: 24px;
  margin-bottom: 10px;
}

.portfolio-item-details p {
  font-size: 16px;
  line-height: 1.5;
}

.portfolio-item-link {
  display: inline-block;
  background-color: #333333;
  color: #ffffff;
  padding: 10px 20px;
  text-decoration: none;
  font-weight: bold;
  border-radius: 5px;
  margin-top: 10px;
}

.portfolio-item-link:hover {
  background-color: #555555;
}

footer {
  background-color: #333333;
  color: #ffffff;
  padding: 20px;
  text-align: center;
}

/* Media queries for responsiveness */

@media screen and (max-width: 768px) {
  .video-container {
    width: 100%;
  }
  
  .welcome-box {
    width: 80%;
  }
  
  .welcome-box h2 {
    font-size: 24px;
    margin-bottom: 15px;
  }
  
  .welcome-box p {
    font-size: 14px;
    margin-bottom: 30px;
  }
  
  .dismiss-button {
    font-size: 12px;
    padding: 8px 16px;
  }
  
  .hero-section h1 {
    font-size: 32px;
  }
  
  .hero-section p {
    font-size: 16px;
  }
  
  .portfolio-item {
    width: 100%;
    max-width: 400px;
  }
}