body{
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #111;
    color: white;
}

/* CABEÇALHO */

.cabecalho{
    background: linear-gradient(to bottom, #000, #1a1a1a);

    border-bottom: 4px solid #c40000;

    padding-bottom: 20px;

    box-shadow: 0 5px 15px rgba(0,0,0,0.7);
}

/* LOGO + TÍTULO */

.logo-titulo{
    display: flex;

    align-items: center;

    justify-content: center;

    gap: 25px;

    padding: 30px;
}

.logo{
    width: 120px;

    border-radius: 50%;

    border: 3px solid white;

    box-shadow: 0 0 20px rgba(255,255,255,0.3);
}

/* TÍTULO */

.logo-titulo h1{

    font-size: 60px;

    color: white;

    text-transform: uppercase;

    letter-spacing: 4px;

    text-shadow:
    0 0 10px rgba(255,255,255,0.3),
    0 0 20px rgba(196,0,0,0.6);

    margin: 0;
}

/* MENU */

.menu{

    display: flex;

    justify-content: center;

    gap: 20px;

    list-style: none;

    padding: 0;

    margin-top: 20px;

    flex-wrap: wrap;
}

.menu li a{

    background: #1f1f1f;

    color: white;

    text-decoration: none;

    padding: 15px 25px;

    border-radius: 12px;

    border: 2px solid #333;

    font-weight: bold;

    transition: 0.3s;

    display: inline-block;

    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
}

.menu li a:hover{

    background: #c40000;

    transform: translateY(-5px);

    border-color: white;
}

/* BANNER */

.banner{

    display: block;

    margin: 40px auto;

    width: 80%;

    border-radius: 20px;

    border: 3px solid #c40000;

    box-shadow: 0 8px 20px rgba(0,0,0,0.7);
}
}
iframe {
    border-radius: 15px;
    border: 3px solid #c40000;
    box-shadow: 0 5px 15px rgba(0,0,0,0.5);
}
<a href="https://www.corinthians.com.br" target="_blank">Site Oficial do Corinthians</a>

<style>
a {
  color: white;
}
</style>