styles.css

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  line-height: 1.5;
}
.container {
  display: block;
  width: 90%;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}
.container.main {
  padding-top: 30px;
}
code, .code {
  font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;
  color: #666;
}
.info {
  font-size: 13px;
  font-style: italic;
  color: #666;
  margin-top: 40px;
}
a {
  color: #007ee5;
}
input {
  border: 2px solid #007ee5;
  border-radius: 3px;
  padding: 8px;
  font-size: 16px;
}
.button, button {
  border-radius: 3px;
  background-color: #007ee5;
  border: none;
  color: #fff;
  font-size: 16px;
  padding: 10px 15px;
  text-decoration: none;
}

.page-header {
  background-color: #007ee5;
  padding: 10px 0 0 0;
}
.page-header .container {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 150px;
}
.page-header a {
  color: #fff;
  text-decoration: none;
}
.page-header nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.page-header h1 {
  display: flex;
  align-items: center;
  color: #fff;
  font-size: 17px;
  font-weight: 200;
}
.page-header .logo {
  width: 100px;
  margin-right: 10px;
}
.page-header .view-source {
  font-weight: 200;
  font-size: 12px;
}
.page-header h2 {
  color: #fff;
  font-size: 18px;
  font-weight: normal;
}