body {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1%;
  background-color: #13293d;
  color: #fff;
}

h1 {
  font-size: 200%;
}

h2 {
  margin: 2% 0;
  font-size: 250%;
}

nav ul {
  display: flex;
  justify-content: space-between;
  min-width: 300px;
}

nav a {
  color: #b9C6ae;
  font-weight: bold;
  text-decoration: none;
}

nav a:hover {
  color: #fff;
}

main {
  display: flex;
  flex: 1 1 0;
  max-width: 1200px;
  margin: 2% auto;
}

article {
  border-bottom: 1px solid #d8a47f;
}

article p {
  margin: 2% 0;
  font-size: 110%;
}

article ul {
  margin-left: 5%;
  font-size: 110%;
  list-style: circle;
}

form {
  max-width: 400px;
}

form h3 {
  font-size: 150%;
}

form p {
  margin: 3% 0;
}

label {
  display: block;
}

button {
  padding: 1% 2%;
  color: #fff;
  background-color: #13293d;
  border: none;
  outline: none;
  cursor: pointer;
}

/* The default appearance is removed and replaced with a custom image */
select {
  -moz-appearance: none;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("../images/arrow.png");
  background-repeat: no-repeat;
  background-position: right;
  background-size: contain;
}

.text-input {
  width: 100%;
  max-width: 100%;
}

.text-input, select {
  padding: 1%;
  outline: none;
  border: 1.2px solid #b9C6ae;
}

.text-input:hover, .checkbox:hover, 
select:hover, button:hover {
  box-shadow: 0 0 5px #999;
}

/* The right-side border changes when the element is clicked on or tabbed into */
.text-input:focus {
  border-right-width: 5px;
}

/* The border becomes dashed when the element's placeholder text is visible */
.text-input:placeholder-shown {
  border-style: dashed;
}

.flex-row {
  display: flex;
  align-items: center;
}

.flex-row select {
  flex: 1 0 0;
  margin-left: 2%;
}

.flex-row input {
  margin-right: 2%;
}

/* The font style of the adjacent element changes when the given element is checked */
.checkbox:checked + label {
  color: #999999;
  font-style: italic;
}

/* When checked, the adjacent element has text insert at the end */
.checkbox:checked + label::after {
  margin-left: 10px;
  font-size: 90%;
  content: "(thanks!)";
}

footer {
  display: flex;
  justify-content: center;
  padding: 2%;
  background-color: #13293d;
  color: #fff;
}

@media screen and (max-width: 768px) {
  header {
    flex-direction: column;
  }
}