body {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  background-color: #6495ed;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 2fr 2fr;
  grid-gap: 64px;
}
.grid-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.grid-secondary-main {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
}

.grid-secondary-main img {
  max-width: 300px;
  margin: 20px;
  border: 1px solid blue;
  border-radius: 5px;
}
.grid-secondary-main img:hover {
  transform: scale(1.2);
}
.grid-embed {
  display: grid;
  grid-template-columns: 1fr;
}

.card {
  background-color: antiquewhite;
  margin: 30px 0;
}
.card-body {
  padding: 30px;
}
.card-footer {
  padding: 30px;
}
.button {
  display: block;
  color: white;
  background-color: #6495ed;
  font-weight: 700;
  font-size: 14px;
  line-height: 21px;
  text-align: center;
  letter-spacing: 3px;
  text-transform: uppercase;
  padding: 16px;
  border-radius: 2px;
  text-decoration: none;
}
.button:hover {
  background-color: darkblue;
  color: white;
  transform: scale(1.05);
  transition: all 0.2s ease-in-out;
}

.text-center {
  text-align: center;
}
.img-responsive {
  max-width: 100%;
  display: block;
  text-align: center;
}
.responsive-video {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  max-width: 800px;
  margin: 0 auto 40px;
}

.responsive-video iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

header {
  background-image: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
    url("/images/hangul.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: antiquewhite;
  text-align: center;
  padding: 50px 0;
}
header h1 {
  font-style: normal;
  font-size: 96px;
  font-weight: 700;
  line-height: 1;
  margin: 30px 0;
}

header h2 {
  font-style: normal;
  font-size: 40px;
  font-weight: 400;
  line-height: 1.5;
  margin: 0 0 10 0;
}
header h3 {
  font-style: normal;
  font-size: 24px;
  font-weight: 900;
  line-height: 1.5;
  letter-spacing: 3px;
  margin: 0;
}

header a {
  font-weight: 700;
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
  letter-spacing: 3px;
  text-transform: uppercase;
  text-decoration: none;
  background-color: antiquewhite;
  color: blueviolet;
  border-radius: 3px;
  padding: 10px;
  margin-bottom: 10px;
}

main {
  background-color: antiquewhite;
}
main h2 {
  font-weight: 700;
  font-size: 40px;
  line-height: 1.5;
  margin: 0;
}
main h3 {
  font-weight: 700;
  font-size: 16px;
  line-height: 24px;
  letter-spacing: 5px;
  opacity: 0.5;
  text-transform: uppercase;
  margin: 0;
}
main h4 {
  font-weight: 700;
  font-size: 16px;
  line-height: 1;
  margin: 0;
}
main h5 {
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  margin: 0;
}
main p {
  font-style: normal;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  opacity: 0.7;
}
section {
  max-width: 100%;
  margin: 0 auto;
  padding: 100px;
}
section.secondary {
  background-color: lightcyan;
}

footer {
  color: antiquewhite;
  background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)),
    url("../images/seoul-by-night.jpeg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
footer h3 {
  font-weight: 700;
  font-size: 20px;
  line-height: 30px;
}
footer p {
  font-weight: 400;
  font-size: 16px;
  line-height: 24px;
}
footer ul {
  margin: 0;
  padding: 0;
}
footer li {
  list-style: none;
  margin: 0;
  padding: 0;
}

footer a {
  color: antiquewhite;
}

@media (max-width: 960px) {
  header {
    padding: 30px 0;
  }
  header h1 {
    font-size: 36px;
  }
  header h2 {
    font-size: 18px;
  }
  header h3 {
    font-size: 12px;
  }
  section {
    padding: 20px;
  }
  .grid {
    grid-template-columns: 1fr;
  }
  .grid-main {
    grid-template-columns: 1fr;
  }
  .grid-secondary-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    text-align: center;
  }
}