.navbar-default{ background: #000000; }#masthead.sticky{ position:fixed; 0; z-index:99999;margin:0 auto 30px; width:100%;}#masthead.sticky .navbar-default{ background:rgba(0, 0, 0, 0.9)}.header{ margin-top: 30px}.header{ margin-bottom: 30px}body{ background-image: url(); background-size: cover;background-position: 0 0;background-repeat: no-repeat;background-attachment: fixed;}