@charset "utf-8";

html {
   background-color: rgb(184, 202, 219);
}

body {
   font-family: Verdana, Geneva, sans-serif;
   color: rgb(91, 91, 91);
   background-color: ivory;
}

header {
   text-align: center;
   padding: 20px;
}

header img {
   width: 100%;
   max-height: 220px;
   object-fit: contain;
   padding: 0;
}

h1, h2 {
   text-shadow: 4px 6px 5px gray;
}

h2 {
   font-size: 1.3em;
}

nav ul {
   list-style: none;
   margin: 0;
   padding: 0;
   overflow: hidden;
}

nav li {
   display: block;
}

nav a {
   display: block;
   background-color: rgb(70, 95, 120);
   line-height: 2.8em;
   text-decoration: none;
   text-align: center;
   color: ivory;
}

nav a:hover {
   background-color: gray;
   color: white;
}

main {
   padding: 20px;
   margin-top: 35px;
}

body > footer {
   clear: both;
   background-color: rgb(70, 95, 120);
   color: rgba(255, 255, 255, 0.7);
   font-weight: bold;
   font-size: 0.9em;
   line-height: 3em;
   text-align: center;
   margin-top: 10px;
   padding: 10px;
}

ul {
   list-style-type: square;
}

.gallery {
   display: flex;
   flex-wrap: wrap;
   justify-content: center;
   gap: 10px;
}

.gallery img {
   width: 23%;
   height: 200px;
   object-fit: cover;
}

@media only screen and (max-width: 768px) {
   body {
      width: 100%;
      margin: 0;
   }

   nav li {
      float: none;
      font-size: x-large;
      width: 100%;
   }

   nav a {
      border-bottom: 1px solid black;
   }

   main > img {
      width: 90%;
      float: none;
   }

   .gallery img {
      width: 48%;
   }
}

@media only screen and (max-width: 480px) {
   .gallery img {
      width: 100%;
   }
}

@media only screen and (min-width: 769px) {
   html {
      background-image: url("background.jpg");
      background-repeat: no-repeat;
      background-position: center center;
      background-size: cover;
      background-attachment: fixed;
   }

   body {
      width: 90%;
      margin-left: auto;
      margin-right: auto;
      margin-top: 0;
      margin-bottom: 0;
   }

   nav li {
      width: 20%;
      float: left;
   }

   main > img {
      width: 25%;
      padding: 25px;
      float: right;
   }
}