body {
  background-color: white;
  color: black;
  font-family: Arial;
  font-size:14px;
  padding:0;
  margin:0;
}

aside {
  width:250px;
  margin-top:30px;
}

div.flex {
  display: flex;
  margin-right:150px;
  justify-content:center;
}

nav {
  height:auto;
  font-size:15px;
  font-family: Arial Black;
}

h1 {
  font-family: Arial Black;
  font-size: 30px;
}

header {
  max-height:200px;
  height:200px;
  margin: 0;
  justify-content: center;
  align-items: center;
}

main {
  margin-left:50px;
  margin-right:10px;
  width:100%;
}

section {
  margin-bottom:10px;

}
article { 
  margin-top:30px;
  margin-bottom:15px;
}
.subtitle {
  background-color:#E09410;
  padding:5px;
  padding-left:10px;
  font-size:15px;
}

ul
{
    list-style-type: none;
}

.links {
  text-decoration: none;
  list-style-type:none;
  padding-left:10px;
}
.links li {
  margin-bottom:10px;
}
.links li a {
  color:black;
}  
.links li:before, .links li:after {
  letter-spacing: 0.1em;
  }
.nav {
  padding:10px;
  padding-right:100px;
  background-color: #E09410;
  display:flex;
  justify-content:flex-end;
  color:white;
}

.nav li a {
  text-decoration: none;
  color: white;
  padding-left:30px;
  padding-inline:2rem;
  display:block;
}

.left-sidebar {
  margin-left:200px;
}
.subtitle {
  font-family:Arial Black;
  color:white;
  font-size:15px;
  text-align:left;
}
article .subtitle {
  margin-top:10px;
  margin-left:5px;
  margin-right:5px;
  margin-bottom:10px;
}

@media only screen and (max-width: 800px) {
  .flex {
    flex-wrap:wrap;
  }
  aside {
    display:flex;
    width:100%;
    margin-left:20px;
    margin-right:20px;
  }
  aside > section {
    margin-right:10px;
  }
  .nav {
    margin-left:0px;
    margin-right:50px;
  }
  .nav li {
    padding-bottom:5px;
  }
}
[id] {
    display: none;
}
[id]:target {
  display:block;
}

div.flexbox {
  display: flex;
  padding: 20px;
  justify-content:center;
  align-items: center;
}

div.flexbox .element {
  padding: 20px;
}