footer { height: 16vw; }
.footer { position: fixed; left: 0; right: 0; bottom: 0; display: flex; background: #FFF; padding: 5px 0 0; border-top: 2px solid orange; }
    .footer a { flex: 1; text-align: center; font-size: 12px; line-height: 2; }
        .footer a img { width: 6.25vw; margin: 1.25vw auto 0; }
        .footer a .send { position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 20.125vw; margin: 0; }
input[type=button], input[type=submit], input[type=file], button { cursor: pointer; -webkit-appearance: none; }