.d-block {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}

body {
  background-color: #02071e;
  color: #1640f9;
}

nav {
  background-color: #02071e;
  border-width: 10px;
  border-color: #1640f9;
  border: 2px solid #1640f9;
  border-radius: 10px;
  padding: 10px;
  margin: 20px;
}


.header {
  border-width: 10px;
  border-color: #02071e;
  border: 5px solid #02071e;
  margin: 20px;
  padding: 10px;
  font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
  background-color: #02071e;
  border: 5px solid #02071e;
  background: url("./th.jpg") no-repeat center center fixed;
  background-size: cover;
}

h2 {
  color: blue;
}


.col-12.col-md-4 {
  width: 350px;
  margin: 10px;
  background-color: #949292;
  border-radius: 5px;
  flex: auto;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.card-img-top{
  margin: 30px;
  width:  250px;
  height: 200px;
  background-color: #949292;
}



.carousel.slide {
  margin: 100px;
  background-color: #060c3c;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}



/* Media query for mobile devices */
@media (max-width: 768px) {
  .d-block {
    width: 90%; 
  }

  .carousel.slide {
    margin: 20px; 
  }

  
}

.footer {
  clear: both;
  font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
  text-align: center;
  background-color: #02151e;
  padding: 20px 0;
  color: #f4f6fd;
  font-size: 14px;
}

.footer h2 {
  font-size: 20px;
}

.footer p {
  margin: 0;
}


.title {
  text-align: center;
  color: white;
}