div.social-networks-icons a {
    margin: 0 7px;
    text-decoration: none;
}

div.social-networks-icons a img {
    width: 20px;
    height: 20px;
    vertical-align: center;
}

div.social-networks-icons a:first-child {
    margin-left: 0
}

div.social-networks-icons a:last-child {
    margin-right: 0
}

@media screen and (max-width: 600px) {
    div.social-networks-icons {
        text-align: center;
    }

    div.social-networks-icons a {
        margin: 0 16px;
        text-decoration: none;
    }

    div.social-networks-icons a img {
        width: 25px;
        height: 25px;
    }
}

@media screen and (max-width: 400px) {
    div.social-networks-icons a {
        margin: 0 10px;
        text-decoration: none;
    }
}