* {
    margin: 0;
    padding: 0;
    box-sizing: border-box; 
}
body {
    font-family: Arial, sans-serif;
    background-color: black;
    color: white;
}
div a {
    text-decoration: none;
    color: white;
    width: 100%;
    padding: 10px;
    font-size: 15px;
    text-align: left;
}
header {
    background-color: black;
    padding: 20px;
    text-align: center;
}
h1 {
    font-size: 2.5em;
    margin-bottom: 15px;
    color: grey;
    text-shadow: 2px 2px 4px #000000;
}
button a {
    border-radius: 0.5em;
    display: inline-block;
    text-decoration: none;
    color: rgb(148, 143, 143);
    font-family: Arial, sans-serif;
    font-size: 16px;
    padding: 10px;
    background-color: black;
    cursor: pointer;
}
button a:hover {
    background-color: rgb(193, 182, 182);
    color: black;
}
main {
    padding: 20px;
    text-align: center;
    background-color: grey;
    border-radius: 10px;
    width: 100%;
}
footer {
    background-color: black;
    color: white;
    text-align: center;
    padding: 15px;
}
/* Efeito suave no "About Us" */
main {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 1s ease, transform 1s ease;
}
main.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Transições suaves em geral */
header img, header h1, header button {
    transition: all 1s ease;
}