estilo.css

@charset 'UTF-8';

html body {
    height: 100%;
    background: linear-gradient(to bottom, #00509b, #95ccff);
    font-family: Arial, Helvetica, sans-serif;
}
header {
    color: #ffffff;
    text-align: center;
    text-shadow: 1px 1px 5px #0000003f;
}
section {
    background-color: #ffffff;
    border-radius: 10px;
    padding: 15px;
    width: 80vw;
    margin: auto;
    box-shadow: 5px 5px 10px #0000003f;
}
footer {
    color: #ffffff;
    text-align: center;
    font-style: italic;
}
img { 
    width: 250px;  
    height: 250px;
    border-radius: 50%;
    box-shadow: 2px 2px 10px #0000003f;
    display: block;
    margin: 0 auto;
}
div {
    text-align: center;
    text-shadow: 1px 1px 5px #0000003f;
}
a {
    text-decoration: none;
    font-weight: bold;
    color: #ffffff;
}
a:hover {
    color: #00478a;
    text-decoration: underline;
}