html, body {
  margin-top: 0px;
  margin-right: auto;
  margin-bottom: 0px;
  margin-left: auto;
  background-color: #333333;
  padding-top: 0px;
  padding-right: 0px;
  padding-bottom: 0px;
  padding-left: 0px;
  width: 960px;
  height: 100%;
}
a:link {
  text-decoration: none;
  color: white;
}
a:visited {
  text-decoration: none;
  color: white;
}
a:hover {
  text-decoration: none;
  font-weight: bold;
  color: white;
}
a:active {
  text-decoration: none;
  font-weight: bold;
  color: white;
}
.content {
  color: white;
  font-family: "Helvetica";
  min-height: 100%;
  position: relative;
  overflow: auto;
  z-index: 0;
}
.main_content {
  color: black;
  background-color: white;
  font-family: "Helvetica";
  width: 640px;
  position: relative;
  overflow: auto;
  z-index: 0;
}
.main_content a:link {
  text-decoration: none;
  font-weight: bold;
  color: black;
}
.main_content a:visited {
  font-weight: bold;
  text-decoration: none;
  color: black;
}
.main_content a:hover {
  text-decoration: underline;
  font-weight: bold;
  color: black;
}
.main_content a:active {
  text-decoration: none;
  font-weight: bold;
  color: black;
}

.background {
  position: absolute;
  z-index: -1;
  top: 0px;
  bottom: 0px;
  margin-top: 0px;
  margin-right: 0px;
  margin-bottom: 0px;
  margin-left: 0px;
  padding-top: 0px;
  padding-right: 0px;
  padding-bottom: 0px;
  padding-left: 0px;
}
.top_block {
  width: 100%;
  display: block;
}
.bottom_block {
  position: absolute;
  width: 100%;
  display: block;
  bottom: 0px;
}
.left_block {
  display: block;
  float: left;
}
.right_block {
  display: block;
  float: right;
}
.center_block {
  display: block;
  width: auto;
}
.header {
  width: 100%;
  height: 200px;
  background-color: black;
}
.background.nav {
  height: auto !important;
  padding-bottom: 0px;
  left: 0px;
  width: 160px;
  background-color: black;
  margin-top: 200px;
  margin-bottom: 50px;
}
.nav {
  height: auto;
  width: 160px;
  padding-bottom: 50px;
}
.background.aside {
  height: auto !important;
  padding-bottom: 0px;
  right: 0px;
  width: 160px;
  background-color: black;
  margin-top: 200px;
  margin-bottom: 50px;
}
.aside {
  height: auto;
  width: 160px;
  padding-bottom: 50px;
}
.footer {
  width: 100%;
  height: 50px;
  background-color: black;
}