.menu {
  position: absolute;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 40px;
}

.content {
  overflow: auto;
  position: absolute;
  margin-top: 55px;
  left: 12%;
  width: 75%;
  height: 82%;
}

.x {
  position: absolute;
  left: 85%;
  margin-top: 48px;
  z-index: 1;
}

.sidebar {
  position: absolute;
  width: 20%;
  top: 0px;
  height: 100%;
  left: 80%;
}

.footer {
  position: absolute;
  top: 97%;
}