#container>div {
  border: 1px solid black;
  /*
  border-size: 1px;
  border-style: solid;
  border-color: black;
  */
  padding: 0 5px;
  /*
  padding: top right bottom left;
  padding top/bottom left/right;
  padding top right/left bottom;
  */
  /* direct children of container */
}

#masthead, #footer {
  text-align: center;
}

#masthead {
  margin-bottom: 10px;
}

#navigation {
  width: 200px;
  float: left;
}

#navigation ul {
  list-style-type: none;
  margin-left: 0;
  padding-left: 0;
}

.supplement {
  width: 200px;
  float: right;
  clear: right;
  margin-bottom: 10px;
}

.post {
  margin: 0 220px 10px;
}

/*.post img {
  float: right;
  margin: 5px;
}*/

#footer {
  clear: both;
}

#container {
  margin: 0 20px;
}

a:hover {
  color: red;
}