.footer_main {
    background-repeat: repeat-x;
    background-size: 70em;
    background-color: #000000;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-grow: 1;
    padding-left: 1em;
    padding-right: 1em;
}

.footer_main .social_network {
    display: flex;
}

.footer_main .copyright {
    color: rgba(255,255,255,0.75);
    font-size: 12px;
}

.footer_main .copyright > a {
    text-decoration: initial;
}

@media (max-width: 767px) {
    .footer_main  {
        flex-direction: column;
        padding-top: 2em;
    }

    .footer_main .social_network {
        margin-top: 0.2em;
        margin-bottom: 0em;
    }

    .footer_main .copyright {
        margin-top: 1em;
        width: auto;
        text-align: center;
    }
}

@media (min-width: 768px) {
    .footer_main  {
        flex-direction: row;
        padding-top: 0.5em;
    }

    .footer_main .social_network {
        margin-top: 1.5em;
        margin-bottom: 1em;
    }

    .footer_main .copyright {
        margin-top: 2.2em;
        text-align: right;
        width: 42em;
    }
}

.footer_main .copyright > a {
    color: rgba(255, 255, 255, 0.75);
}

.footer_main .copyright > a:hover {
    color: rgba(255, 255, 255, 1);
    text-decoration: initial;
}

#facebook_footer {
    width: 1.8em;
    height: 1.8em;
    background-repeat: no-repeat;
    margin-right: 0.6em;
    opacity: 0.75;
    cursor: pointer;
}

#twitter_footer {
    width: 1.8em;
    height: 1.8em;
    background-repeat: no-repeat;
    margin-right: 0.6em;
    opacity: 0.75;
    filter: invert(100%);
    cursor: pointer;
}

#youtube_footer {
    width: 1.8em;
    height: 1.8em;
    background-repeat: no-repeat;
    margin-right: 0.6em;
    opacity: 0.75;
    filter: invert(100%);
    cursor: pointer;
}

#instagram_footer {
    width: 1.8em;
    height: 1.8em;
    background-repeat: no-repeat;
    margin-right: 0.6em;
    opacity: 0.75;
    filter: invert(100%);
    cursor: pointer;
}

#mail_footer {
    width: 1.8em;
    height: 1.8em;
    background-repeat: no-repeat;
    margin-right: 0em;
    opacity: 0.75;
    filter: invert(100%);
    cursor: pointer;
}

#facebook_footer:hover, #facebook_footer:focus {
    opacity: 1;
    outline: none;
}

#twitter_footer:hover, #twitter_footer:focus {
    opacity: 1;
    outline: none;
}

#youtube_footer:hover, #youtube_footer:focus {
    opacity: 1;
    outline: none;
}

#instagram_footer:hover, #instagram_footer:focus {
    opacity: 1;
    outline: none;
}

#mail_footer:hover, #mail_footer:focus {
    opacity: 1;
    outline: none;
}