body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-image: url(3492868.gif);
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
  text-align: center;
}

header {
  background-color: none;
  padding: 10px;
  text-align: center;
}

h1 {
  color: white;
  font-size: 28px;
  text-align: center;
}

p {
  color: white;
  font-size: 18px;
  line-height: 1.5;
  margin-top: 20px;
margin-right: 20px;
margin-bottom: 20px;
}

figure {
  margin-bottom: 20px;
  border-color: white;
  box-shadow: 0 0 10px white;
  display: inline-block;
  align-items: center;
}

h2 {
  color: white;
  font-size: 24px;
  margin: 0;
  background-color:#555;
  text-align: center;
  margin-left: 520px;
  margin-right: 500px;
  padding: 10px;
  border-radius: 10px;
  
}

h2:hover{
  background-color: #ffffff61;
}


h3 {
  color: white;
  font-size: 24px;
  margin-bottom: 10px;
}

ul {
  list-style-type: none;
  padding-left: 20px;
  font-size: large;
}

li {
  margin-bottom: 10px;
  color: white;
  background-color: #555;
  border-radius: 10px;
  margin-left: 500px;
  margin-right: 500px;
  padding: 30px;
  font-size: 20px;
}
li:hover {
background-color: #ffffff61;
}

a {
  color: white;
  text-decoration: none;
}

a:hover {
  color: white;
  text-decoration: underline;
}

button {
  padding: 10px 20px;
  margin: auto;
  background-color: #555;
  color: #fff;
  text-decoration: none;
  border: 1px solid #fff;
  border-radius: 5px;
  font-size: 15px;
  cursor: pointer;
}

.button:hover {
  background-color: #333;
}

.image-container {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.image-container img {
  margin: 10px;
  width: 500px;
}

body {
  text-align: center;
}

p {
margin-top: 20px;
margin-right: 20px;
margin-bottom: 20px;
}

#pagina{
  margin-top: 100px;
}

#web{
  margin-left: 20px;
  margin-right: 20px;
}

#cs{
  margin-left: 20px;
  margin-right: 20px;
}

#arc{
  margin-left: 20px;
  margin-right: 20px;
  display: inline-block;
}

#so{
  margin-left: 20px;
  margin-right: 20px;
}

.arc{
  float: left;
  list-style: none;
  margin: 10px;
}

nav ul li{
  margin-left: 20px;
  margin-right: 20px;
  display: inline-block;
}