header {
  background-image: url(imagens/cloud.jpg);
  display: flex;
  flex-direction: row-reverse;
}

.caixa {
  display: flex;
  flex-direction: row;
  flex: 1;
  align-items: center;
}

.petimg,
.petimgmeio,
.petimg2 {
  height: 200px;
}

nav {
  flex-direction: row;
  display: flex;
  flex: 1;
  justify-content: center;
  align-items: center;
}

nav ul {
  display: flex;
}

nav li {
  padding: 0 0 0 15px;
}

li a {
  font-weight: bold;
  font-size: 25px;
  text-transform: uppercase;
  position: relative;
  text-decoration: none;
  color: #ff00ff;
}

nav a:hover {
  color: #ff0000;
  font-size: 27px;
  text-decoration: underline overline dotted blue;
}

main {
  background-image: url(imagens/snowing.jpg);
  align-content: center;
}

.titulomain {
  font-size: 35px;
  text-align: center;
  margin: 20px;
  padding: 10px;
  color: #00ff00;
}

main p {
  font-size: 28px;
  text-align: center;
  padding: 5px;
  color: #00ff00;
}

.imgmain {
  width: 100%;
  height: 500px;
  display: inline-block;
  padding: 5px 0;
}

footer {
  background-image: url(imagens/bystars.png);
  text-align: center;
  padding: 30px 0 0;
}

.copyright {
  color: red;
  font-weight: bold;
}