body {
  margin: 0;
  font-family: sans-serif;
}
article {
  max-width: 760px;
  margin: auto;
}
p {
  font-size: 18px;
  line-height: 1.4;
}

#header {
  height: 15vh;
  background: url(https://img.freepik.com/free-photo/empty-sea-beach-background_74190-313.jpg?t=st=1654536758~exp=1654537358~hmac=406d5f2a46954b77e631c43af91426f7895547366ca7fb47a7c78e1144cabf50&w=1380);
  background-size: cover;
}
#nav {
  background-color: rgba(47, 153, 240, 0.918);
  top: 0;
  width: 100%;
}
#nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
}
#nav li {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}
#nav ul li a {
  color: #f1f0ea;
  transition: all 0.4s;
}
#nav ul li img {
  height: 96px;
  transition: height 0.4s;
}
#nav.fixed {
  position: fixed;
  box-shadow: 5px 5px 19px 0px rgba(0, 0, 0, 0.5);
}
#nav.fixed ul li img {
  height: 36px;
}
#nav.fixed ul li a {
  font-size: 14px;
}