nav {
  overflow: hidden;
  background-color: black;
  transition: top 0.3s;
  position: fixed;
  width: 100%;
}

nav a {
  color: white;
  text-decoration: none;
  display: block;
  text-align: center;
  float: left;
  padding: 12px 14px;
  transition: background-color 0.5s, color 0.5s;
}

nav a:hover {
  background-color: darkgray;
  color: lightgray;
}

nav a.active {
  background-color: darkgray;
  color: white;
}

header {
	background-image: linear-gradient(to bottom right, lightblue, purple);
	text-align: center;
	padding: 250px;
}

body {
  margin: 0px;
}

.row {
  display: flex;
  flex-direction: row;
}

/* Three columns side by side */
.column {
 width: 500px;
}

/* Display the columns below each other instead of side by side on small screens */
@media only screen and (max-width: 1000px) {
  .column, .row {
    width: 100%;
    display: block;
  }
}

/* Add some shadows to create a card effect */
.card {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
}

/* Some left and right padding inside the container */
.container {
  padding: 0 16px;
}

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

.title {
  color: grey;
}

.button {
  border: none;
  outline: 0;
  display: inline-block;
  padding: 8px;
  color: white;
  background-color: #000;
  text-align: center;
  cursor: pointer;
  width: 100%;
}

.button:hover {
  background-color: #555;
}