#contenedor-header {
    background-color: blue;
    color: black;
    border-radius: 20px;
    padding : 15px;
    display : flex;
    border: 5px gray solid;
    margin : 15px;
}

ul {
  display: flex;
  justify-content: center;
  list-style: none;
  margin : 15px;
}

li {
  background-color: white;
  color: white;
  font-size: 20px;
  border-radius: 20px;
  padding:15px;
  margin:3px;
}

a {
    color : black;
    text-decoration: none;
    padding: 15px;
}


h1{
    text-align: center;
    background: blue;
    padding: 0;
    margin: 0;
}

h2{
    text-align: center;
    background: blue;
    padding: 0;
    margin: 0;
}

h3{
    text-align: center;
    background: blue;
    padding: 0;
    margin: 0;
}

h4{
    text-align: center;
    font-size: 25px;
}

img{
    border-radius: 20px;
    display: block;
    margin: auto;
    margin-top: 15px;
    margin-bottom: 15px;
}

p{
    background: blue;
    border: 5px green solid;
    border-radius: 20px;
    font-size: 20px;
    padding:15px;
}

body{
    background-color: lightblue;
}