.logo {
    margin: auto;
}

    .logo > img {
        display: block;
        margin: auto;
    }

    .logo.is-small {
        width: 10rem;
    }

    .logo.is-medium {
        width: 15rem;
    }

    .logo.is-large {
        width: 20rem;
    }

@media screen and (max-width: 768px) {
    .logo.is-large {
        width: 100%;
    }
}

.logo.is-fullwidth {
    width: 100%;
}

.columns.is-fullheight {
    height: 100vh;
}