app.css

/* app css stylesheet */

.header{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 10%;
  background-color: rgb(43, 74, 99);
  color: white;
  text-align: center;
}

.menu {
  position: fixed;
  top: 58px;
  left: 0;
  width: 100%;
  height: 3%;
  background-color: rgb(248, 249, 250);
  color: white;
  text-align: left;
  list-style: none;
  border-bottom: 0px solid rgb(120, 120, 120);
  margin-bottom: 2em;
  padding: 10px 20px 10px;
}

.menu:before {
  content: "|";
}

.menu:after {
  content: "|";
}

.menu > li {
  display: inline;
}

.menu > li + li:before {
  content: "|";
  padding-right: 0.3em;
}

.view {
  position: fixed;
  left: 0;
  top: 120px;
}

.footer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  background-color: rgb(120, 120, 120);
  color: white;
  text-align: center;
}