Twentyfifteen customization CSS for business site

custom.css

body, html { overflow-y: auto; }
body.home.page main#main { display: none; }
body:before { display: none }
#colophon{ display: none }

article.hentry {
    box-shadow: rgba(0,0,0,0.5) 0 2px 7px;
}

#secondary .nav-menu li {
    display: block;
    float: none;
    border-bottom: 1px solid #555;
}

.sidebar {
    background: rgba(31, 31, 31, 0.66);
    min-height: 90%;
}