*
{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
}

body
{
    min-height: 100vh;
    display:grid;
    place-items: center;
    background:
    radial-gradient(1000px 500px at 70% 10%,
    #15404e,#0f4d63);
    color: white;
    padding: 16px;
}

.contenedor
{
    background: rgba(255,255,255,.1);
    border: 1px solid rgba(255,255,255,.15);
    border-radius: 16px;
    padding: 48px 32px;
    width:100%;
    max-width: 480px;
    text-align: center;
    box-shadow: 0px 16px 64px rgba(0,0,0,.32);
}