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HTML

About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

Learn more · Versions

CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                 <section>
            <h2>Круг</h2>

            <div id="circle"></div>

            <div class="code">
                <pre>
			#circle {
				width: 120px;
				height: 120px;
				background: #7fee1d;
				-webkit-border-radius: 60px;
				-moz-border-radius: 60px;
				border-radius: 60px;
			}
				
</pre>
            </div>
        </section>

        <section>
            <h2>Квадрат</h2>

            <div id="square"></div>

            <div class="code">
                <pre>
				#square { 
				   width: 120px;
				   height: 120px;
				   background: #f447ff; 
				}
				
</pre>
            </div>
        </section>

        <section>
            <h2>Прямоугольник</h2>

            <div id="rectangle"></div>

            <div class="code">
                <pre>
				#rectangle { 
					width: 220px;
					height: 120px;
					background: #4da1f7; 
				}
            
</pre>
            </div>
        </section>

        <section>
            <h2>Овал</h2>

            <div id="oval"></div>

            <div class="code">
                <pre>
		#oval {
			width: 200px;
			height: 100px;
			background: #e9337c;
			-webkit-border-radius: 100px / 50px;
			-moz-border-radius: 100px / 50px;
			border-radius: 100px / 50px;
		}
		
</pre>
            </div>
        </section>

        <section>
            <h2>Треугольник</h2>

            <div id="triangle"></div>

            <div class="code">
                <pre>
			   
		#triangle{
		   width: 0; 
		   height: 0;  
		   border-bottom: 140px solid #fcf921; 
		   border-left: 70px solid transparent; 
		   border-right: 70px solid transparent; 
		}

            
</pre>
            </div>
        </section>

        <section>
            <h2>Треугольник острием вниз</h2>

            <div id="triangle_down"></div>

            <div class="code">
                <pre>
		  #triangle_down {
			width: 0;
			height: 0;
			border-top: 140px solid #20a3bf;
			border-left: 70px solid transparent;
			border-right: 70px solid transparent;
		}
                
</pre>
            </div>
        </section>

        <section>
            <h2>Треугольник острием влево</h2>

            <div id="triangle_left"></div>

            <div class="code">
                <pre>
		#triangle_left {
			width: 0;
			height: 0;
			border-top: 70px solid transparent;
			border-right: 140px solid #6bbf20;
			border-bottom: 70px solid transparent;
		}
                    
</pre>
            </div>
        </section>

        <section>
            <h2>Треугольник острием вправо</h2>

            <div id="triangle_right"></div>

            <div class="code">
                <pre>
                
		#triangle_right{
			width: 0;
			height: 0;
			border-top: 70px solid transparent;
			border-left: 140px solid #ff5a00;
			border-bottom: 70px solid transparent;
		}
                   
</pre>
            </div>
        </section>

        <section>
            <h2>Ромб</h2>

            <div id="diamond"></div>

            <div class="code">
                <pre>
		   #diamond {
			width: 120px;
			height: 120px;
			background: #1eff00;
		/* Rotate */
			-webkit-transform: rotate(-45deg);
			-moz-transform: rotate(-45deg);
			-ms-transform: rotate(-45deg);
			-o-transform: rotate(-45deg);
			transform: rotate(-45deg);
		/* Rotate Origin */
			-webkit-transform-origin: 0 100%;
			-moz-transform-origin: 0 100%;
			-ms-transform-origin: 0 100%;
			-o-transform-origin: 0 100%;
			transform-origin: 0 100%;
			margin: 60px 0 10px 310px;
		}
    
</pre>
            </div>
        </section>

        <section>
            <h2>Трапеция</h2>

            <div id="trapezium"></div>

            <div class="code">
                <pre>
		#trapezium {
			height: 0;
			width: 120px;
			border-bottom: 120px solid #ec3504;
			border-left: 60px solid transparent;
			border-right: 60px solid transparent;
		}
		
</pre>
            </div>
        </section>

        <section>
            <h2>Параллелограмм</h2>

            <div id="parallelogram"></div>

            <div class="code">
                <pre>
			#parallelogram {
				width: 160px;
				height: 100px;
				background: #8734f7;
				-webkit-transform: skew(30deg);
				-moz-transform: skew(30deg);
				-o-transform: skew(30deg);
				transform: skew(30deg);
			}
			
</pre>
            </div>
        </section>

        <section>
            <h2>Звезда</h2>

            <div class="box-position" style="margin: 60px auto;">
                <div id="star"></div>
            </div>

            <div class="code">
                <pre>
   
		#star {
			width: 0;
			height: 0;
			margin: 50px 0;
			color: #fc2e5a;
			position: relative;
			display: block;
			border-right: 100px solid transparent;
			border-bottom: 70px solid #fc2e5a;
			border-left: 100px solid transparent;
			-moz-transform: rotate(35deg);
			-webkit-transform: rotate(35deg);
			-ms-transform: rotate(35deg);
			-o-transform: rotate(35deg);
		}

		#star:before {
			height: 0;
			width: 0;
			position: absolute;
			display: block;
			top: -45px;
			left: -65px;
			border-bottom: 80px solid #fc2e5a;
			border-left: 30px solid transparent;
			border-right: 30px solid transparent;
			content: '';
			-webkit-transform: rotate(-35deg);
			-moz-transform: rotate(-35deg);
			-ms-transform: rotate(-35deg);
			-o-transform: rotate(-35deg);
		}

		#star:after {
			content: '';
			width: 0;
			height: 0;
			position: absolute;
			display: block;
			top: 3px;
			left: -105px;
			color: #fc2e5a;
			border-right: 100px solid transparent;
			border-bottom: 70px solid #fc2e5a;
			border-left: 100px solid transparent;
			-webkit-transform: rotate(-70deg);
			-moz-transform: rotate(-70deg);
			-ms-transform: rotate(-70deg);
			-o-transform: rotate(-70deg);
		}

</pre>
            </div>
        </section>

        <section>
            <h2>Шестиконечная звезда</h2>

            <div class="box-position">
                <div id="star_six_points"></div>
            </div>

            <div class="code" style="margin-top: 160px;">
                <pre>
		  #star_six_points {
			width: 0;
			height: 0;
			display: block;
			position: absolute;
			border-left: 50px solid transparent;
			border-right: 50px solid transparent;
			border-bottom: 100px solid #de34f7;
			margin: 10px auto;
		}

		#star_six_points:after {
			content: "";
			width: 0;
			height: 0;
			position: absolute;
			border-left: 50px solid transparent;
			border-right: 50px solid transparent;
			border-top: 100px solid #de34f7;
			margin: 30px 0 0 -50px;
		}

</pre>
            </div>
        </section>

        <section>
            <h2>Пятиугольник</h2>

            <div class="box-position" style="margin-top: 45px;">
                <div id="pentagon"></div>
            </div>

            <div class="code">
                <pre>
	#pentagon {
		width: 54px;
		position: relative;
		border-width: 50px 18px 0;
		border-style: solid;
		border-color: #277bab transparent;
	}

	#pentagon:before {
		content: "";
		height: 0;
		width: 0;
		position: absolute;
		top: -85px;
		left: -18px;
		border-width: 0 45px 35px;
		border-style: solid;
		border-color: transparent transparent #277bab;
	}
                    
</pre>
            </div>
        </section>

        <section>
            <h2 style="margin-bottom: 35px;">Шестиугольник</h2>

            <div class="box-position">
                <div id="hexagon"></div>
            </div>

            <div class="code" id="margin-hexagon">
                <pre>
		#hexagon {
			width: 100px;
			height: 55px;
			background: #fc5e5e;
			position: relative;
			margin: 10px auto;
		}

		#hexagon:before {
			content: "";
			width: 0;
			height: 0;
			position: absolute;
			top: -25px;
			left: 0;
			border-left: 50px solid transparent;
			border-right: 50px solid transparent;
			border-bottom: 25px solid #fc5e5e;
		}

		#hexagon:after {
			content: "";
			width: 0;
			height: 0;
			position: absolute;
			bottom: -25px;
			left: 0;
			border-left: 50px solid transparent;
			border-right: 50px solid transparent;
			border-top: 25px solid #fc5e5e;
		}

</pre>
            </div>
        </section>

        <section>
            <h2>Восьмиугольник</h2>

            <div class="box-position">
                <div id="octagon"></div>
            </div>

            <div class="code">
                <pre>
		#octagon {
			width: 100px;
			height: 100px;
			background: #ac60ec;
			position: relative;
		}

		#octagon:before {
			content: "";
			width: 42px;
			height: 0;
			position: absolute;
			top: 0;
			left: 0;
			border-bottom: 29px solid #ac60ec;
			border-left: 29px solid #f4f4f4;
			border-right: 29px solid #f4f4f4;
		}

		#octagon:after {
			content: "";
			width: 42px;
			height: 0;
			position: absolute;
			bottom: 0;
			left: 0;
			border-top: 29px solid #ac60ec;
			border-left: 29px solid #f4f4f4;
			border-right: 29px solid #f4f4f4;
		}
                   
</pre>
            </div>
        </section>

        <section>
            <h2>Сердце</h2>

            <div class="box-position">
                <div id="heart"></div>
            </div>

            <div class="code" id="margin-heart">
                <pre>
		  
		#heart {
			position: relative;
		}

		#heart:before,#heart:after {
			content: "";
			width: 70px;
			height: 115px;
			position: absolute;
			background: #ff0000;
			left: 70px;
			top: 0;
			-webkit-border-radius: 50px 50px 0 0;
			-moz-border-radius: 50px 50px 0 0;
			border-radius: 50px 50px 0 0;
			-webkit-transform: rotate(-45deg);
			-moz-transform: rotate(-45deg);
			-ms-transform: rotate(-45deg);
			-o-transform: rotate(-45deg);
			transform: rotate(-45deg);
			-webkit-transform-origin: 0 100%;
			-moz-transform-origin: 0 100%;
			-ms-transform-origin: 0 100%;
			-o-transform-origin: 0 100%;
			transform-origin: 0 100%;
		}

		#heart:after {
			left: 0;
			-webkit-transform: rotate(45deg);
			-moz-transform: rotate(45deg);
			-ms-transform: rotate(45deg);
			-o-transform: rotate(45deg);
			transform: rotate(45deg);
			-webkit-transform-origin: 100% 100%;
			-moz-transform-origin: 100% 100%;
			-ms-transform-origin: 100% 100%;
			-o-transform-origin: 100% 100%;
			transform-origin: 100% 100%;
		}
		
</pre>
            </div>
        </section>

        <section>
            <h2>Яйцо</h2>

            <div id="egg"></div>

            <div class="code" style="padding: 10px 120px 0 20px;">
                <pre>
#egg {
    width: 136px;
    height: 190px;
    background: #ffc000;
    display: block;
    -webkit-border-radius: 63px 63px 63px 63px / 108px 108px 72px 72px;
    border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
}

</pre>
            </div>
        </section>

        <section>
            <h2>Символ бесконечности</h2>

            <div id="infinity"></div>

            <div class="code">
                <pre>
		#infinity {
			width: 220px;
			height: 100px;
			position: relative;
		}

		#infinity:before,#infinity:after {
			content: "";
			width: 60px;
			height: 60px;
			position: absolute;
			top: 0;
			left: 0;
			border: 20px solid #06c999;
			-moz-border-radius: 50px 50px 0;
			border-radius: 50px 50px 0 50px;
			-webkit-transform: rotate(-45deg);
			-moz-transform: rotate(-45deg);
			-ms-transform: rotate(-45deg);
			-o-transform: rotate(-45deg);
			transform: rotate(-45deg);
		}

		#infinity:after {
			left: auto;
			right: 0;
			-moz-border-radius: 50px 50px 50px 0;
			border-radius: 50px 50px 50px 0;
			-webkit-transform: rotate(45deg);
			-moz-transform: rotate(45deg);
			-ms-transform: rotate(45deg);
			-o-transform: rotate(45deg);
			transform: rotate(45deg);
		}    
		
</pre>
            </div>
        </section>

        <section>
            <h2>Облачко с комментарием</h2>

            <div id="comment_bubble"></div>

            <div class="code">
                <pre>
		#comment_bubble {
		   width: 140px;
		   height: 100px;
		   background: #088cb7;
		   position: relative;
		   -moz-border-radius:    12px;
		   -webkit-border-radius: 12px;
		   border-radius:         12px;

		}
		#comment_bubble:before {
		   content:"";
		   width: 0;
		   height: 0;
		   right: 100%;
		   top: 38px;
			position: absolute;
		   border-top: 13px solid transparent;
		   border-right: 26px solid #088cb7;
		   border-bottom: 13px solid transparent;
		}
		
</pre>
            </div>
        </section>

        <section>
            <h2>Pacman</h2>

            <div id="pacman"></div>

            <div class="code">
                <pre>
		#pacman {
		width: 0;
		height: 0;
		border-right: 70px solid transparent;
		border-top: 70px solid #ffde00;
		border-left: 70px solid #ffde00;
		border-bottom: 70px solid #ffde00;
		border-top-left-radius: 70px;
		border-top-right-radius: 70px;
		border-bottom-left-radius: 70px;
		border-bottom-right-radius: 70px;
	}            
	
</pre>
            </div>
        </section>
!

CSS 

              
                /* https://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}


/* 
 * These selection declarations have to be separate
 * No text-shadow: twitter.com/miketaylr/status/12228805301
 * Also: hot pink!
 */

::-moz-selection { background: #fe57a1; color: #fff; text-shadow: none; }
::selection { background: #fe57a1; color: #fff; text-shadow: none; }


/* =============================================================================
   Links
   ========================================================================== */

a:hover, a:active { outline: 0; }

/*=========================================
	Main Styles
=========================================*/
body {
background: #f8f8f8;
font-size: 15px;
line-height: 25px;
color: #515151;
}

#images {
padding-top: 100px;
width: 880px;
height: 440px;
margin: 0 auto;
}

#thumbnails {
float: left;
width: 440px;
margin-top: 20px;
}

#mainimage {
float: right;
width: 430px;
height: 430px;
background: #ffffff;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
-webkit-box-shadow: 0px 0px 3px 1px #989898;
-moz-box-shadow: 0px 0px 3px 1px #989898;
box-shadow: 0px 0px 3px 1px #989898;
padding: 5px;
}

#mainimage img {
width: 430px;
height: 430px;
}

.image {
opacity: 0.8;
position: relative;
float: left;
background: #ffffff;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
-webkit-box-shadow: 0px 0px 3px 1px #989898;
-moz-box-shadow: 0px 0px 3px 1px #989898;
box-shadow: 0px 0px 3px 1px #989898;
-webkit-transition: all 200ms ease;
-moz-transition: all 200ms ease;
-o-transition: all 200ms ease;
transition: all 200ms ease;
padding: 5px;
width:90px;
height: 90px;
margin-left: 15px;
margin-right: 15px;
margin-top: 15px;
margin-bottom: 15px;
}

.image img {
width: 90px;
height: 90px;
}

.image:hover {
cursor: pointer;
opacity: 1;
z-index: 5;
-moz-transform: scale(1.5);
-webkit-transform: scale(1.5);
-o-transform: scale(1.5);
-ms-transform: scale(1.5);
transform: scale(1.5);
}

#imageplaceholder {
background: url('images/test1.jpg');
background-size: 100%;
width: 430px;
height: 430px;
}

/*=======================================
	THIS IS WHERE IT GETS MESSY
=======================================*/
#test1:target #imageplaceholder{
background: url('images/test1.jpg');
}

#test2:target #imageplaceholder{
background: url('images/test2.jpg');
}

#test3:target #imageplaceholder{
background: url('images/test3.jpg');
}

#test4:target #imageplaceholder{
background: url('images/test4.jpg');
}

#test5:target #imageplaceholder{
background: url('images/test5.jpg');
}

#test6:target #imageplaceholder{
background: url('images/test6.jpg');
}

#test7:target #imageplaceholder{
background: url('images/test7.jpg');
}

#test8:target #imageplaceholder{
background: url('images/test8.jpg');
}

#test9:target #imageplaceholder{
background: url('images/test9.jpg');
}
!

JS
!
999px

Console