header {
  border-width: 10px;
  outline-color: grey;
  border-style: outset;
  background-color: cadetblue;
  padding: 10px;
  text-align: center;
  font-size: 35px;
  color: #000000;
}

* {
  box-sizing: border-box;
}
.row::after {
  content: "";
  clear: both;
  display: table;
}

.column {
  float: left;
  width: 33.33%;
  padding: 5px;
}

.nav {
  outline-color: grey;
  background-color: cadetblue;
  border-style: outset;
  border-width: 10px;
  padding: 10px;
}

body {
  outline-color: grey;
  border-width: 10px;
  border-style: outset;
  text-align: center;
  background-image: linear-gradient(to right, cadetblue, rgb(240,248,255));
}

ul {
  text-decoration:line-through
    background-image: linear-gradient(to right, rgb(240,248,255), aliceblue);
}
p {
  text-align: center;
  color: black;
}

h2 {
  text-align: center;
}

h1 {
  font-weight: bold;
  text-align:center;
}

img {
  float:inherit;
}
h6 {
  float: right;
}
p {
  text-align: center;
  color: black;
}

h2 {
  text-align: center;
}

h1 {
  font-weight: bold;
  text-align:center;
}
img {
  float:inherit;
}
h6 {
  float: right;
}

topnav {
  text-align: center;
  overflow: hidden;
  background-color: #333;
  list-style-type: none;
  margin: 0;
  padding: 0;
  width: 300px;
}