Basic.css/css/basic.min.css

*{box-sizing:border-box}:root{--mono:'Courier New',Courier,'Ubuntu Mono','Liberation Mono',monospace;--c1:#0074d9;--c2:#eee;--c3:#fff;--c4:#000;--c5:#fff;--m1:8px;--rc:8px}@media (prefers-color-scheme:dark){:root{--c2:#333;--c3:#1e1f20;--c4:#fff}}html{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}body{margin:0;font:1em/1.6 system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Droid Sans,Helvetica Neue,Fira Sans,sans-serif;font-weight:400;font-style:normal;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;background-color:var(--c3);color:var(--c4)}iframe,img{border:none;max-width:100%}a{color:var(--c1);text-decoration:none}a:hover{color:var(--c1);text-decoration:underline}pre{font:1em/1.6 var(--mono);background:var(--c2);padding:1em}code{font:1em/1.6 var(--mono)}blockquote{border-left:5px solid var(--c2);padding:1em 1.5em;margin:0}hr{border:0;border-bottom:1px solid var(--c4)}h1,h2,h3,h4,h5,h6{margin:.6em 0;font-weight:400}h1{font-size:2.625em;line-height:1.2}h2{font-size:1.625em;line-height:1.2}h3{font-size:1.3125em;line-height:1.24}h4{font-size:1.1875em;line-height:1.23}h5,h6{font-size:1em;font-weight:700}table{border-collapse:collapse;border-spacing:0;margin:1em 0}td,th{text-align:left;vertical-align:top;border:1px solid;padding:.4em}tfoot,thead{background:var(--c2)}button,code,img,input,pre,select,textarea{border-radius:var(--rc)}input,select,textarea{font-size:1em;color:var(--c4);background:var(--c2);border:0;padding:.6em}button{font-size:1em;display:inline-block;color:var(--c5);background:var(--c1);border:0;margin:0 4px;padding:.6em;cursor:pointer;text-align:center}button:focus,button:hover,input:hover,select:hover,textarea:hover{opacity:.8}section{display:flex;flex-flow:row wrap}article,aside{flex:1;margin:var(--m1)}article{background:var(--c2);border-radius:var(--rc);padding:1em;box-shadow:0 1px 0 rgba(0,0,0,.3)}article:first-child,aside:first-child{margin-left:0}article:last-child,aside:last-child{margin-left:0}