body {
    display: flex;
    height: 100%;
    flex-direction: column;
}

footer {
    flex: none;
    margin-top: 3em;
}

header {
    flex: none;
    margin-bottom: 3em;
}

main {
    flex: 1 0 auto;
}

.obfuscated-email {
    direction: rtl;
    unicode-bidi: bidi-override;
}

@keyframes heartbeat
{
    0% { opacity: 1; }
    50% { opacity: .5; }
}