body {
  margin: 10px;
  background-color: rgb(240,240,240);
  font-family: courier;
  font-size: 20px;
}
.column {
  float: left;
  width: 50%;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

.button {
  background-color: #4CAF50;
  border-radius: 12px;
  color: BLACK;
  padding: 5px 15px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
}

.menu {
  margin: auto;
}

.menu ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

.menu li {
  float: left;
}

.menu li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 15px;
}

.menu li a:hover:not(.active) {
  background-color: #111;
}

.active {
  background-color: #4CAF50;
}

a {
    text-decoration: none;
}
a:link, a:visited {
    color: blue;
}
a:hover {
    color: red;
}