html {
    background-image: url('https://2ab1cb94ca.cbaul-cdnwnd.com/9942443f4da3431b3ad181105dcbe47d/200000016-a44c7a44c9/ghostdogbanner.webp?ph=2ab1cb94ca');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

body { 
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-family: system-ui, sans-serif;
}

header {
    display: flex;
    align-items: end;
    background-color: #ffffffad;
    border-bottom: 1px solid rgba(128, 128, 128, 0);
    padding: 10px;
}

.footer {
    background-color: #3f3f3f9f;
    color: #eee;
    text-align: center;
    padding: 20px 0;
    margin-top: auto;
}

nav {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

nav.centrado {
    display: flex;
    justify-content: right;
    flex-wrap: wrap;
    gap: 15px;
    padding: 10px;
}

header button {
    background: #797979;
    color: white;
    border: none;
    border-radius: 40px;
    height: 20px;
    padding: 0 20px;
    margin: 15px 0;
    text-transform: uppercase;
    box-shadow: 0 0 5px black;
    cursor: pointer;
    transition: 0.2s;
}

header button:hover {
    background: dodgerblue;
    box-shadow: 2px 2px 15px dodgerblue;
}

header button.active {
    background: rgb(21, 78, 136);
    box-shadow: 2px 2px 15px rgb(21, 78, 136);
}

section {
    flex: 1;
    min-width: 500px;
    background-color: #ffffffd7;
    border-radius: 5px;
    padding: 10px;
    box-shadow: 2px 2px 5px #CCC;
    flex-direction: column;
    border: 1px solid #DDD;
}