.center {
  margin: auto;
  width: 50%;
  border: 10px solid rgb(25,0,25);
  padding: 10px;
}
body {
    background-color: rgb(50,0,50);
    margin: 0;
    /*min-width: 500px;*/
}
h1,h2,h3,p,img {
  display: block;
  margin: auto;
  width: 80%;
  color: rgb(240,240,160);
  text-align: center;
}

.sidebar {
  margin: 0;
  padding: 0;
  width: 200px;
  background-color: rgb(40,0,40);
  position: fixed;
  height: 100%;
  overflow: auto;
}

.sidebar a {
  display: block;
  color: rgb(240,240,160);
  padding: 16px;
  text-decoration: none;
}

.sidebar a.active {
  background-color: rgb(75,75,75);
  color: white;
}

.sidebar a:hover:not(.active) {
  background-color: rgb(50,50,50);
  color: white;
}

div.content {
  margin-left: 200px;
  padding: 1px 16px;
  height: 1000px;
  img {
      width: 500px;
  }
}

@media screen and (max-width: 800px) {
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
  }
  .sidebar a {float: left;}
  div.content {margin-left: 0;}
}

@media screen and (max-width: 600px) {
  .sidebar a {
    text-align: left;
    float: none;
  }
}