.question{border:1px solid var(--border-color);margin-bottom:5px}.question__nav{padding:7px 10px;border-bottom:1px solid var(--border-color);-webkit-box-pack:left;-ms-flex-pack:left;justify-content:left;-webkit-box-align:center;-ms-flex-align:center;align-items:center}.question__arrow,.question__nav{display:-webkit-box;display:-ms-flexbox;display:flex}.question__arrow{color:var(--primary-color);cursor:pointer}.question__arrow--left{padding-right:5px}.question__arrow--right{padding-left:5px}.question__order{padding:0 5px;border-right:1px solid var(--border-color);border-left:1px solid var(--border-color);letter-spacing:1px;font-size:14px}.question__text{padding:20px}.question__code{border:20px solid #585858;background-color:#272822;position:relative}.question__dots{margin:10px 18px}.question__next{display:-webkit-box;display:-ms-flexbox;display:flex;position:absolute;right:5px;bottom:5px;z-index:99}.question .question__single-answer{border-bottom:1px solid var(--border-color);width:100%;-webkit-transition:opacity .4s;transition:opacity .4s}.question .question__single-answer:hover{opacity:.8}.question .question__single-answer.answered--correct{background-color:#67c23a}.question .question__single-answer.answered--incorrect{background-color:#f56c6c}.question .question__single-answer:last-child{border-bottom:none}.question .CodeMirror{position:relative;overflow:hidden;height:auto;padding-bottom:10px}.question .CodeMirror pre.CodeMirror-line{word-wrap:break-word;white-space:pre-wrap;word-break:normal}.quiz{max-width:600px;margin:0 auto;-webkit-box-flex:1;-ms-flex:1 0 auto;flex:1 0 auto}.dark-mode-switcher{position:absolute;top:10px;right:10px;cursor:pointer}

/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:.67em 0}hr{-webkit-box-sizing:content-box;box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}b,strong{font-weight:bolder}code,kbd,samp{font-family:monospace,monospace;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}img{border-style:none}button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}button,input{overflow:visible}button,select{text-transform:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{border-style:none;padding:0}[type=button]:-moz-focusring,[type=reset]:-moz-focusring,[type=submit]:-moz-focusring,button:-moz-focusring{outline:1px dotted ButtonText}fieldset{padding:.35em .75em .625em}legend{-webkit-box-sizing:border-box;box-sizing:border-box;color:inherit;display:table;max-width:100%;padding:0;white-space:normal}progress{vertical-align:baseline}textarea{overflow:auto}[type=checkbox],[type=radio]{-webkit-box-sizing:border-box;box-sizing:border-box;padding:0}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}details{display:block}summary{display:list-item}[hidden],template{display:none}body{--primary-color:#1da1f2;--primary-color-dark:#1078b8;--primary-bg-color:#fff;--primary-text-color:#100e17;--secondary-text-color:#fff;--link-text-color:#22292f;--border-color:#ccc;font-family:PT Sans,sans-serif;min-height:100vh;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-ms-flex-direction:column;flex-direction:column}body.dark-mode{--primary-color:#ff8a00;--primary-color-dark:#c96e03;--primary-bg-color:#100e17;--primary-text-color:#fff;--secondary-text-color:#fff;--link-text-color:#fff;--border-color:#fff;background-color:#100e17;color:#fff}.tac{text-align:center}#app{padding:0 1em;margin:0 auto;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-ms-flex-direction:column;flex-direction:column;-webkit-box-flex:1;-ms-flex:1;flex:1}#app .icon{width:15px;max-width:15px}#app .icon--medium{width:30px;max-width:30px}#app .no-border{border:none}h1{margin:0;line-height:2.5em}.CodeMirror{height:auto;padding-bottom:10px}main{-webkit-box-flex:1;-ms-flex:1;flex:1}header{margin-bottom:50px}.footer{padding:20px;text-align:center}.button{margin-right:5px;border:0;min-height:40px;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-pack:center;-ms-flex-pack:center;justify-content:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;color:#fff;cursor:pointer;outline:0;background-color:var(--primary-color);min-width:100px;-webkit-transition:background-color .4s;transition:background-color .4s}.button:last-child{margin-right:0}.button--green{background-color:#4fc08d}.button--red{background-color:#e14440}.button--small{min-height:30px;min-width:60px}.button--icon{border-radius:50%;min-width:30px;min-height:30px;padding:0}.disabled{cursor:not-allowed;opacity:.8}.dialog{position:relative;margin:15vh auto 50px;background:var(--primary-bg-color);border-radius:2px;-webkit-box-shadow:0 1px 3px rgba(0,0,0,.3);box-shadow:0 1px 3px rgba(0,0,0,.3);-webkit-box-sizing:border-box;box-sizing:border-box;width:90%;max-width:500px;padding:20px;color:var(--primary-text-color);border:1px solid var(--border-color);-webkit-animation:bounceIn .6s ease;animation:bounceIn .6s ease}.dialog__wrapper{position:fixed;top:0;right:0;bottom:0;left:0;overflow:auto;margin:0;z-index:99;background-color:rgba(0,0,0,.8)}a{color:var(--link-text-color);text-decoration:none}.decoration:before{background-color:var(--link-text-color);bottom:0;content:"";height:1px;left:0;position:absolute;-webkit-transform:scaleX(0);transform:scaleX(0);-webkit-transition:all .3s ease-in-out 0s;transition:all .3s ease-in-out 0s;visibility:hidden;width:100%}.decoration:hover:before{-webkit-transform:scaleX(1);transform:scaleX(1);visibility:visible}.relative{position:relative}.text-red{color:#c73a28}.fade-enter-active,.fade-leave-active{-webkit-transition:opacity .5s;transition:opacity .5s}.fade-enter,.fade-leave-to{opacity:0}code.code--inline{color:#eb5757;border-radius:3px;padding:.2em .4em}.code--block,code.code--inline{background:hsla(44,6%,50%,.15);font-size:.8em}.code--block{padding:20px;min-height:1em;white-space:pre;overflow:auto}.pb-1{padding-bottom:1em}.pt-2{padding-top:2em}.dib{display:inline-block}.dif{display:-webkit-inline-box;display:-ms-inline-flexbox;display:inline-flex}.pointer{cursor:pointer}.default{cursor:default}.w-6{width:1.5em}.h-6{height:1.5em}.fill-current{fill:currentColor}.text-twitter{color:#1da1f2}.text-facebook{color:#3b5998}.text-linkedin{color:#0077b5}.text-reddit{color:#ff654e}.mr-1{margin-right:.75em}.mb-1{margin-bottom:.75em}.text-hackernews{color:var(--link-text-color)}::-webkit-scrollbar{width:12px;background-color:#eff1f5}::-webkit-scrollbar-track{border-radius:3px;background-color:transparent}::-webkit-scrollbar-thumb{border-radius:5px;background-color:#5a6072;border:2px solid #eff1f5}.css-button-3d{min-width:130px;height:40px;color:#fff;padding:5px 10px;font-weight:700;cursor:pointer;-webkit-transition:all .3s ease;transition:all .3s ease;position:relative;display:inline-block;outline:none;border-radius:5px;border:none;background-color:var(--primary-color);-webkit-box-shadow:0 5px var(--primary-color-dark);box-shadow:0 5px var(--primary-color-dark)}.css-button-3d:hover{-webkit-box-shadow:0 3px var(--primary-color-dark);box-shadow:0 3px var(--primary-color-dark);top:1px}.css-button-3d:active{-webkit-box-shadow:0 0 var(--primary-color-dark);box-shadow:0 0 var(--primary-color-dark);top:5px}.sponsorship{text-decoration:none;color:#fff;background-image:linear-gradient(45deg,#ff0a78,#43f);display:block;text-align:center;font-weight:700;padding:15px 50px}.sponsorship-ad{display:inline-block;background:hsla(0,0%,50%,.6);color:rgba(0,0,0,.5);font-size:.7rem;font-weight:700;padding:2px 6px;border-radius:3px;line-height:1;vertical-align:middle;margin-left:5px}@-webkit-keyframes bounceIn{0%{-webkit-transform:scale(.3);transform:scale(.3);opacity:0}50%{-webkit-transform:scale(1.05);transform:scale(1.05);opacity:1}70%{-webkit-transform:scale(.9);transform:scale(.9)}to{-webkit-transform:scale(1);transform:scale(1)}}@keyframes bounceIn{0%{-webkit-transform:scale(.3);transform:scale(.3);opacity:0}50%{-webkit-transform:scale(1.05);transform:scale(1.05);opacity:1}70%{-webkit-transform:scale(.9);transform:scale(.9)}to{-webkit-transform:scale(1);transform:scale(1)}}.CodeMirror{font-family:monospace;height:300px;color:#000;direction:ltr}.CodeMirror-lines{padding:4px 0}.CodeMirror pre.CodeMirror-line,.CodeMirror pre.CodeMirror-line-like{padding:0 4px}.CodeMirror-gutter-filler,.CodeMirror-scrollbar-filler{background-color:#fff}.CodeMirror-gutters{border-right:1px solid #ddd;background-color:#f7f7f7;white-space:nowrap}.CodeMirror-linenumber{padding:0 3px 0 5px;min-width:20px;text-align:right;color:#999;white-space:nowrap}.CodeMirror-guttermarker{color:#000}.CodeMirror-guttermarker-subtle{color:#999}.CodeMirror-cursor{border-left:1px solid #000;border-right:none;width:0}.CodeMirror div.CodeMirror-secondarycursor{border-left:1px solid silver}.cm-fat-cursor .CodeMirror-cursor{width:auto;border:0!important;background:#7e7}.cm-fat-cursor div.CodeMirror-cursors{z-index:1}.cm-fat-cursor .CodeMirror-line::selection,.cm-fat-cursor .CodeMirror-line>span::selection,.cm-fat-cursor .CodeMirror-line>span>span::selection{background:transparent}.cm-fat-cursor .CodeMirror-line::-moz-selection,.cm-fat-cursor .CodeMirror-line>span::-moz-selection,.cm-fat-cursor .CodeMirror-line>span>span::-moz-selection{background:transparent}.cm-fat-cursor{caret-color:transparent}@-webkit-keyframes blink{50%{background-color:transparent}}@keyframes blink{50%{background-color:transparent}}.cm-tab{display:inline-block;text-decoration:inherit}.CodeMirror-rulers{position:absolute;left:0;right:0;top:-50px;bottom:0;overflow:hidden}.CodeMirror-ruler{border-left:1px solid #ccc;top:0;bottom:0;position:absolute}.cm-s-default .cm-header{color:blue}.cm-s-default .cm-quote{color:#090}.cm-negative{color:#d44}.cm-positive{color:#292}.cm-header,.cm-strong{font-weight:700}.cm-em{font-style:italic}.cm-link{text-decoration:underline}.cm-strikethrough{text-decoration:line-through}.cm-s-default .cm-keyword{color:#708}.cm-s-default .cm-atom{color:#219}.cm-s-default .cm-number{color:#164}.cm-s-default .cm-def{color:#00f}.cm-s-default .cm-variable-2{color:#05a}.cm-s-default .cm-type,.cm-s-default .cm-variable-3{color:#085}.cm-s-default .cm-comment{color:#a50}.cm-s-default .cm-string{color:#a11}.cm-s-default .cm-string-2{color:#f50}.cm-s-default .cm-meta,.cm-s-default .cm-qualifier{color:#555}.cm-s-default .cm-builtin{color:#30a}.cm-s-default .cm-bracket{color:#997}.cm-s-default .cm-tag{color:#170}.cm-s-default .cm-attribute{color:#00c}.cm-s-default .cm-hr{color:#999}.cm-s-default .cm-link{color:#00c}.cm-invalidchar,.cm-s-default .cm-error{color:red}.CodeMirror-composing{border-bottom:2px solid}div.CodeMirror span.CodeMirror-matchingbracket{color:#0b0}div.CodeMirror span.CodeMirror-nonmatchingbracket{color:#a22}.CodeMirror-matchingtag{background:rgba(255,150,0,.3)}.CodeMirror-activeline-background{background:#e8f2ff}.CodeMirror{position:relative;overflow:hidden;background:#fff}.CodeMirror-scroll{overflow:scroll!important;margin-bottom:-50px;margin-right:-50px;padding-bottom:50px;height:100%;outline:none;position:relative;z-index:0}.CodeMirror-sizer{position:relative;border-right:50px solid transparent}.CodeMirror-gutter-filler,.CodeMirror-hscrollbar,.CodeMirror-scrollbar-filler,.CodeMirror-vscrollbar{position:absolute;z-index:6;display:none;outline:none}.CodeMirror-vscrollbar{right:0;top:0;overflow-x:hidden;overflow-y:scroll}.CodeMirror-hscrollbar{bottom:0;left:0;overflow-y:hidden;overflow-x:scroll}.CodeMirror-scrollbar-filler{right:0;bottom:0}.CodeMirror-gutter-filler{left:0;bottom:0}.CodeMirror-gutters{position:absolute;left:0;top:0;min-height:100%;z-index:3}.CodeMirror-gutter{white-space:normal;height:100%;display:inline-block;vertical-align:top;margin-bottom:-50px}.CodeMirror-gutter-wrapper{position:absolute;z-index:4;background:none!important;border:none!important}.CodeMirror-gutter-background{position:absolute;top:0;bottom:0;z-index:4}.CodeMirror-gutter-elt{position:absolute;cursor:default;z-index:4}.CodeMirror-gutter-wrapper ::selection{background-color:transparent}.CodeMirror-gutter-wrapper ::-moz-selection{background-color:transparent}.CodeMirror-lines{cursor:text;min-height:1px}.CodeMirror pre.CodeMirror-line,.CodeMirror pre.CodeMirror-line-like{border-radius:0;border-width:0;background:transparent;font-family:inherit;font-size:inherit;margin:0;white-space:pre;word-wrap:normal;line-height:inherit;color:inherit;z-index:2;position:relative;overflow:visible;-webkit-tap-highlight-color:transparent;-webkit-font-variant-ligatures:contextual;font-variant-ligatures:contextual}.CodeMirror-wrap pre.CodeMirror-line,.CodeMirror-wrap pre.CodeMirror-line-like{word-wrap:break-word;white-space:pre-wrap;word-break:normal}.CodeMirror-linebackground{position:absolute;left:0;right:0;top:0;bottom:0;z-index:0}.CodeMirror-linewidget{position:relative;z-index:2;padding:.1px}.CodeMirror-rtl pre{direction:rtl}.CodeMirror-code{outline:none}.CodeMirror-gutter,.CodeMirror-gutters,.CodeMirror-linenumber,.CodeMirror-scroll,.CodeMirror-sizer{-webkit-box-sizing:content-box;box-sizing:content-box}.CodeMirror-measure{position:absolute;width:100%;height:0;overflow:hidden;visibility:hidden}.CodeMirror-cursor{position:absolute;pointer-events:none}.CodeMirror-measure pre{position:static}div.CodeMirror-cursors{visibility:hidden;position:relative;z-index:3}.CodeMirror-focused div.CodeMirror-cursors,div.CodeMirror-dragcursors{visibility:visible}.CodeMirror-selected{background:#d9d9d9}.CodeMirror-focused .CodeMirror-selected{background:#d7d4f0}.CodeMirror-crosshair{cursor:crosshair}.CodeMirror-line::selection,.CodeMirror-line>span::selection,.CodeMirror-line>span>span::selection{background:#d7d4f0}.CodeMirror-line::-moz-selection,.CodeMirror-line>span::-moz-selection,.CodeMirror-line>span>span::-moz-selection{background:#d7d4f0}.cm-searching{background-color:#ffa;background-color:rgba(255,255,0,.4)}.cm-force-border{padding-right:.1px}@media print{.CodeMirror div.CodeMirror-cursors{visibility:hidden}}.cm-tab-wrap-hack:after{content:""}span.CodeMirror-selectedtext{background:none}.cm-s-monokai.CodeMirror{background:#272822;color:#f8f8f2}.cm-s-monokai div.CodeMirror-selected{background:#49483e}.cm-s-monokai .CodeMirror-line::selection,.cm-s-monokai .CodeMirror-line>span::selection,.cm-s-monokai .CodeMirror-line>span>span::selection{background:rgba(73,72,62,.99)}.cm-s-monokai .CodeMirror-line::-moz-selection,.cm-s-monokai .CodeMirror-line>span::-moz-selection,.cm-s-monokai .CodeMirror-line>span>span::-moz-selection{background:rgba(73,72,62,.99)}.cm-s-monokai .CodeMirror-gutters{background:#272822;border-right:0}.cm-s-monokai .CodeMirror-guttermarker{color:#fff}.cm-s-monokai .CodeMirror-guttermarker-subtle,.cm-s-monokai .CodeMirror-linenumber{color:#d0d0d0}.cm-s-monokai .CodeMirror-cursor{border-left:1px solid #f8f8f0}.cm-s-monokai span.cm-comment{color:#75715e}.cm-s-monokai span.cm-atom,.cm-s-monokai span.cm-number{color:#ae81ff}.cm-s-monokai span.cm-comment.cm-attribute{color:#97b757}.cm-s-monokai span.cm-comment.cm-def{color:#bc9262}.cm-s-monokai span.cm-comment.cm-tag{color:#bc6283}.cm-s-monokai span.cm-comment.cm-type{color:#5998a6}.cm-s-monokai span.cm-attribute,.cm-s-monokai span.cm-property{color:#a6e22e}.cm-s-monokai span.cm-keyword{color:#f92672}.cm-s-monokai span.cm-builtin{color:#66d9ef}.cm-s-monokai span.cm-string{color:#e6db74}.cm-s-monokai span.cm-variable{color:#f8f8f2}.cm-s-monokai span.cm-variable-2{color:#9effff}.cm-s-monokai span.cm-type,.cm-s-monokai span.cm-variable-3{color:#66d9ef}.cm-s-monokai span.cm-def{color:#fd971f}.cm-s-monokai span.cm-bracket{color:#f8f8f2}.cm-s-monokai span.cm-tag{color:#f92672}.cm-s-monokai span.cm-header,.cm-s-monokai span.cm-link{color:#ae81ff}.cm-s-monokai span.cm-error{background:#f92672;color:#f8f8f0}.cm-s-monokai .CodeMirror-activeline-background{background:#373831}.cm-s-monokai .CodeMirror-matchingbracket{text-decoration:underline;color:#fff!important}