* {
  margin: 0;
  padding: 0;
  font-family: Roboto, arial;
  box-sizing: border-box;
}

body {
  background-color: dimgrey;
}

#wrapper {
  max-width: 1000px;
  margin: 0 auto;
  background-color: white;
}

#header img {
  width: 100%;
  display: block;
}

nav {
  background-color: darkcyan;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
}

a.menu {
  width: 25%;
  padding: 15px 30px;
  color: white;
  text-decoration: none;
  text-align: center;
  font-size: 20px;
  -webkit-transition: all 1s ease;

}

a.menu:hover {
  background-color: crimson;
}

.active {
  background-color: crimson;
}

article {
  margin-top: 30px;
  margin-bottom: 20px;
  padding: 0 20px;
}

article h1 {
  font-size: 30px;
  text-align: center;
  margin: 0 10% 20px 10%;
  padding-bottom: 15px;
  border-bottom: 5px solid crimson;
}

img.left {
  float: left;
  margin: 0px 10px 10px 0px;
  width: 25%;
  border-radius: 10% 10%;
}

article p {
  text-align: justify;
  line-height: 25px;
  font-size: 18px;
  padding: 15px 0px;
}

iframe {
  width: 100%;

}

footer {
  height: 20px;
  background-color: darkcyan;
  color: white;
  line-height: 15px;
  text-align: center;
  margin-top: 10px;
}

@media (max-width: 800px) {
  nav a {
    width: 50%;
  }
}