body {
    background: #d3d3d3;
    font: normal 15pt Arial;

}

header {
    color: white;
    text-align: center;
}

section {
    background: white;
    border-radius: 10px;
    padding: 15px;
    width: 500px;
    margin: auto;
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.329);
}

footer {
    color: white;
    text-align: center;
    font-style: italic;
}
.btn-contar {
    background: linear-gradient(90deg, #b0b0b0 0%, #c0c0c0 100%);
    color: #333;
    border: none;
    border-radius: 6px;
    padding: 8px 20px;
    font-size: 1em;
    font-weight: 500;
    cursor: pointer;
    box-shadow: 2px 2px 8px rgba(0,0,0,0.1);
    transition: background 0.3s, transform 0.2s, box-shadow 0.2s;
    outline: none;
    margin-top: 10px;
}
.btn-contar:hover {
    background: linear-gradient(90deg, #a9a9a9 0%, #b9b9b9 100%);
    transform: scale(1.05);
    box-shadow: 3px 3px 10px rgba(0,0,0,0.15);
}