*, *::after, *::before {
    border: 0;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    scroll-behavior: smooth;
}

.bg-grey {
    background-color: #e0e0e0;
}

.text-justify {
    text-align: justify;
}

.ebook-width {
    width: 75%;
}

.opis-width {
    width: 90%;
}

.black-border-bottom {
    border-bottom: 3px solid #000000;
}

.partner {
    width: auto;
    height: 100px;
}

.kontakt-box {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}

.social-ico {
    width: 30px;
    height: 30px;
    margin: 0 5px 0 5px;
    box-sizing: border-box;
}

.social-link, .social-link:hover {
    text-decoration: none;
}

@media screen and (max-width: 768px) {
    .ebook-width {
        width: 50%;
    }
}