:root{--MAIN-LINK-color:#a31c1c;--MENU-SEARCH-BG-color:#252c31;--MENU-SEARCH-BOX-color:#000000;--MENU-SEARCH-BOX-ICONS-color:#ffffff;--MENU-HEADER-BG-color:#a00000;--MENU-HEADER-BORDER-color:#cc1010;--MENU-SECTION-ACTIVE-CATEGORY-color:#fff;--MENU-SECTION-ACTIVE-CATEGORY-BG-color:#777}body{font-weight:normal}#body{margin-left:400px}#sidebar{width:400px}@media only all and (max-width:47.938em){#sidebar{width:230px;left:-230px}#body{margin-left:0;width:100%}.sidebar-hidden{overflow:hidden}.sidebar-hidden #sidebar{left:0}.sidebar-hidden #body{margin-left:230px;overflow:hidden}.sidebar-hidden #overlay{position:absolute;left:0;right:0;top:0;bottom:0;z-index:10;background:rgba(255,255,255,0.5);cursor:pointer}}#sidebar ul.topics li.parent ul.range-sections,#sidebar ul.topics>li.active ul.range-sections{display:none}#sidebar ul.topics li.parent>ul.range-sections,#sidebar ul.topics li.active>ul.range-sections{display:block}.small-video{width:640px;margin:auto}.video-responsive{overflow:hidden;padding-bottom:56.25%;position:relative;height:0}.video-responsive iframe{left:0;top:0;height:100%;width:100%;position:absolute}.author{font-weight:200;text-align:center;margin-top:-1.2rem;display:block;font-size:2rem;text-rendering:optimizelegibility}.index-links{font-family:"Consolas","DejaVu Sans Mono",monospace}