header {
  background: #016b06;
  padding: 10px 0;
  border-bottom: solid 4px;
  border-color: #ebc000;
}

.caixa {
  position: relative;
  width: 85%;
  margin: 0 auto;
}

nav {
  position: absolute;
  top: 20px;
  right: 0px;
  font-family: arial;
}

nav ul {
  padding: 0;
  display: flex;
  justify-content: center;
  list-style: none;
}

nav li {
  display: inline-block;
  margin: 0 0 0 15px;
}

nav a {
  color: #f5f5f5;
  text-decoration: none;
  font-weight: 500;
  font-size: 22px;
  position: relative;
}

nav a::after {
  content: " ";
  width: 0%;
  height: 3px;
  background-color: #ebc000;
  position: absolute;
  bottom: 0;
  left: 0;
  transition: 0.5s ease-in-out;
}

nav a:hover::after {
  width: 100%;
}

main {
  font-family: arial;
  margin: 0 8px 0 8px;
}

body {
  background-color: #494949;
}

.titulo {
  position: relative;
  width: 70%;
  margin: 0 auto 10px 8px;
  padding: 5px 0 0;
}

.titulo hr {
  border-color: #ebc000;
  margin: 0 0 10px;
}

.titulo p {
  font-size: medium;
  margin: 0 auto 0 8px;
}

h1 {
  color: #ffffff;
  font-size: large;
  margin: 0 0 0 8px;
}

.paragrafo {
  position: relative;
  width: 70%;
  margin: 0 auto 0 8px;
}

.paragrafo hr {
  border-color: #ebc000;
  margin: 0 0 10px;
}

.paragrafo li {
  font-weight: 600;
  font-size: large;
}

.paragrafo p {
  margin: 0 0 0 4px;
}

p {
  color: #ffffff;
}

ul {
  display: inline;
}

li {
  margin: 10px auto 0 8px;
  font-weight: 600;
  font-size: large;
  color: #ffffff;
}

.list {
  position: relative;
  width: 820px;
}

.list hr {
  border-color: #ebc000;
  margin: 0 0 8px;
}

.boxvid {
  position: relative;
  width: 320px;
  font-size: 14px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  margin: 0 auto 10px 0;
}

footer {
  text-align: center;
  background-color: #016b06;
  padding: 20px 0;
}

.copyr {
  margin: 20px 0 0;
  font-size: 13px;
  font-family: Arial;
}

/* Media query para telas de smartphones */
@media screen and (max-width: 480px) {
  .caixa {
    width: 95%;
  }

  nav {
    position: static;
    text-align: center;
    margin-top: 10px;
  }

  nav a {
    font-size: 18px;
    display: block;
    padding: 10px;
  }

  header {
    padding: 20px 0;
  }

  .titulo,
  .paragrafo,
  .imgcont {
    width: 90%;
    margin: 10px auto;
  }

  h1 {
    margin: 0 auto;
    text-align: center;
  }
}

/* Media query para telas de tablets */
@media screen and (min-width: 480px) and (max-width: 768px) {
  .caixa {
    width: 90%;
  }

  nav {
    position: static;
    text-align: center;
    margin-top: 10px;
  }

  nav a {
    font-size: 20px;
    display: block;
    padding: 10px;
  }

  header {
    padding: 15px 0;
  }

  .titulo,
  .paragrafo,
  .imgcont {
    width: 85%;
    margin: 10px auto;
  }

  h1 {
    margin: 0 auto;
    text-align: center;
  }
}