body {
   font-family: Helvetica;
   background-color: whitesmoke;
   padding: 30px 20px 20px 20px;
}

nav {
   position: fixed;
   top: 0;
   left: 0;
   right: 0;
   background-color: #262626;
   display: flex;
   justify-content: center;
   align-items: center;
   padding: 8px;
}

nav a {
   color: #fff;
   text-decoration: none;
   margin: 8px;
}

#gold-rush {
   height: 100vh;
   background-color: #272727;
   position: relative;
}

#gold-rush .content {
   position: absolute;
   top: 0;
   left: 0;
   right: 0;
   bottom: 0;
   height: 0px;
   visibility: collapse;
   transition: all .2s;
}

#gold-rush:hover #gold-rush .content {
   height: 100vh;
   visibility: visible;
}