estilo.css

*{
    padding: 0;
    margin: 0;
}
header{
    text-align: center;
    background-color: black;
    color: rgb(255, 255, 255);
    padding: 10px;
    image-resolution: 30px;
}
section {
    align-content: center;
}
nav {
    background-color: rgb(0, 0, 0);
    width: 100%;
    list-style-type: none;
    text-align: center;
}
nav li {
    display: inline-flex;
}
nav a {
    text-decoration: none;
    color: rgb(255, 255, 255);
    padding: 10px;
    width: 150px;
}
nav li:hover {
    background-color: aqua;
}

body {
    margin: 0;
    padding: 0;
    background: url(img/background.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    font-family: sans-serif;
    background-attachment: fixed;
    overflow: scroll;
}

/* Aqui comienza lo del body */

h1 {
    text-align: center;
    color: white;
    -webkit-text-stroke: 1px black;
}

h2{
    text-align: center;
    color: white;
    -webkit-text-stroke: 1px black;
}

.imagen{
    width: 150px;
    height: 150px;
    border-color: white;
    border-width: 3px;
    border-style: solid;
    border-radius: 10px;

}
img {
    width: 150px;
    height: 150px;
    border-color: white;
    border-width: 3px;
    border-style: solid;
    border-radius: 10px;
    }