Style3.css

div.gallery {
  border: 1px solid #ccc;
}

div.gallery:hover {
  border: 1px solid #777;
}

div.gallery img {
  width: 100%;
  height: auto;
}

div.desc {
  padding: 15px;
  text-align: center;
}

* {
  box-sizing: border-box;
}

.responsive {
  padding: 0 6px;
  float: left;
  width: 31.33%;
  margin-right: 2%;
  color: beige;
}

@media only screen and (max-width: 700px) {
  .responsive {
    width: 49.99999%;
    margin-right: 0;
    margin-bottom: 6px;
  }
}

@media only screen and (max-width: 500px) {
  .responsive {
    width: 100%;
    margin-right: 0;
  }
}

.clearfix:after {
  content: "";
  display: table;
  clear: both;
}

h2{
  font-family: Segoe UI;
  font-size: 70px;
  color: white;
  text-shadow: 1px 1px 20px black, 0 0 40px blue, 0 0 60px darkblue;
  text-align: center;
}

h4{
  font-family: Segoe UI;
  font-size: 20px;
  color: rgb(76, 95, 116);
  text-shadow: 1px 1px 20px black, 0 0 40px blue, 0 0 60px darkblue;
  text-align: center;
}

body{
  background-image: url("IMG/BGC.webp");
  background-repeat: no-repeat;
  background-size: cover;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #fff;
  padding: 10px 20px;
}

#header-logo img {
  height: 50px;
}

nav ul {
  list-style: none;
  display: flex;
  margin: 0;
  padding: 0;
}

nav li {
  margin-right: 20px;
}

nav a {
  color: #fff;
  text-decoration: none;
}