.wp-block-navigation__responsive-container-open.wp-block-navigation__responsive-container-open.wp-block-navigation__responsive-container-open {
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    display: none;
}
.subheader-both-center #Subheader .title {
    width: 100%;
    text-align: center;
    display: none;

@media only screen and (max-width: 767px) {
    #Subheader {
        padding: 10px 0;
    }

#Footer .widgets_wrapper {
    padding: 1px 0;
}

For brushing up on your CSS knowledge, check out http://www.w3schools.com/css/css_syntax.asp

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