body {
  font-size: 110%;
  color: green;
  font-family: Arial, Helvetica, sans-serif;
  margin: 0px;
  padding: 0px;
  min-height: 100vh;
}
header {
  background-color: #5D5F60;
  color: #C7D2D5;
  clear: both;
  overflow: hidden;
}
.menubar {
  position: relative;
  width: 20%;
  float: left;
  overflow-y: scroll;
  top: 0px;
  bottom: 0px;
  left: 0px;
  padding: 1em;
}
.sidebar {
  float: right;
  width: 25%;
}
.content {
  float: left;
  padding: 1em;
  width: 68%;
}
header,
footer {
  clear: both;
}
.block {
  outline: 1px solid black;
  padding: 1em;
}