styles.css

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  font-size: 14px;
  margin: 0;
  padding: 0;
}

* {
  box-sizing: border-box;
}

a {
  color: #2196f3;
}
a:hover {
  text-decoration: none;
}

.header {
  color: #fff;
  text-align: center;
  background-color: #F1F2B5;
  background-image: linear-gradient(120deg, #135058, #F1F2B5);
  padding: 2rem;
}

.header__title {
  font-size: 2.5rem;
  font-weight: bold;
}

.header_tagline {
  margin: 1rem 0 2rem;
  opacity: 0.85;
}

.header__button {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-size: 1.25rem;
  padding: 1.5rem;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
  border-style: solid;
  border-width: 1px;
  border-radius: 0.3rem;
  transition: color 0.2s, background-color 0.2s, border-color 0.2s;
}
.header__button:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}
.header__button__image {
  margin-left: 1rem;
  -webkit-filter: invert(1);
  filter: invert(1);
}

.container {
  width: 1000px;
  max-width: 100%;
  margin: 0 auto;
  padding: 2rem;
}

.section {
}

.section__header {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: #135058;
}