body {
  background: linear-gradient(black,blue);
  font-family: helvetica, Verdana;
  display:flex;
}

h1{
  margin:0;
  }

#container{
  background-image: url("https://64.media.tumblr.com/4763bf03d1e60770f0a51ea8d2c0af9e/dc01afdb2094e4fc-15/s500x750/1cfae0e042b9d61a5180fba4fe327ad4269a7cae.jpg");
  background-position:center;
  width: 1000px;
  height:500px;
  margin-left: auto;
  margin-right:auto;
  }

#header {
  background-color:black; 
  color: white;
  text-align: center;
}

#content {
  color:grey;
  background: clear;
  }
 
 #nav a{
  box-shadow: 0px 1px 0px 0px #a6827e;
	background:linear-gradient(to bottom, #7d5d3b 5%, #634b30 100%);
	background-color:#7d5d3b;
	border-radius:6px;
	border:1px solid #54381e;
	display:inline-block;
	cursor:pointer;
	color:#ffffff;
	font-family:Arial;
	font-size:15px;
	font-weight:bold;
	padding:6px 24px;
	text-decoration:none;
	text-shadow:0px 1px 0px #4d3534;
  }
  
#nav a:hover{
  background:linear-gradient(to bottom, #634b30 5%, #7d5d3b 100%);
	background-color:#634b30;
    }
 
 #nav ul{
   list-style-type:none;
   padding:0;
   color: #d7e8bc;
   }
  
#nav{
 width:500px;
 background-color: grey;
 margin-left: auto;
 margin-right:auto;
}
    
#nav .selected {
  font-weight: bold;
  }   
  
h3{
  color: #447f98;
    }
    
#main{
  width:1000px;
  }
  
  #footer {
  clear:both;
  padding: 10px;
  color: white;
  text-align: right;
    }
    
.parent {
    display: grid;
    clear:both;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 8px;
}
    
.div2 {
    grid-row-start: 2;
}

.div2:hover{
  filter:grayscale(1);
  }

.dropdown {
  position: relative;
}
  
.dropdown-content{
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 130px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  padding: 12px 16px;
  }

.dropdown:hover .dropdown-content {
  display: block;
}

.div3 {
    grid-row-start: 2;
}

.div3:hover{
  filter:grayscale(1);
  }

.div4 {
    grid-row-start: 2;
}

.div4:hover{
  filter:grayscale(1);
  }