html {
    margin: 0 20px 20px;
}

.header__logo--special {
    top: 20px;
    width: 120px;
    height: 100px;
}

.header__logo--special img {
    opacity: 1;
}

@media (min-width: 800px) {
    .header__logo--special {
        width: 160px;
        height: 140px;
    }
}