.subtitle {
    font-size: 1.5em;
}

.sign-in {
    float: right;
}

.display-img {
    display: block;
    max-height: 40vh;
    max-width: 100%;
    margin: 2em auto;
}

@media screen and (max-width: 768px) {
    .sign-in {
        float: unset;
    }
}