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HTML 

              
                <div id="nav-icon">☰</div>
<div id="nav-mask"></div>
<nav id="navbar">
	<header> 
		<h2>CSS shape guide</h2>
		<p>Written by Jenny HOU</p>
	</header>
	<ul>
		<a class="nav-link" href="#Introduction" target="_self"><li>Introduction</li></a>
		<a class="nav-link" href="#Pure_CSS_heart" target="_self"><li>Pure CSS heart</li></a>
		<a class="nav-link" href="#8-tooth_CSS_gear" target="_self"><li>8-tooth CSS gear</li></a>
		<a class="nav-link" href="#CSS_tomato_consisted_of_circle_and_pentagram" target="_self"><li>CSS tomato consisted of circle and pentagram</li></a>
		<a class="nav-link" href="#CSS_solid_pentagram" target="_self"><li>CSS solid pentagram</li></a>
		<a class="nav-link" href="#CSS_hollow_pentagram" target="_self"><li>CSS hollow pentagram</li></a>
	</ul>
</nav>
<a href="#"><div style="position: fixed; right: 1rem; bottom: 6rem; width: 2.5rem; height: 2.5rem; text-align: center; line-height: 2.5rem; color: white; background: rgba(0,0,0,0.1); border-radius: 2.5rem;">Top↑</div></a>
<a href="#fin"><div style="position: fixed; right: 1rem; bottom: 3rem; width: 2.5rem; height: 2.5rem; text-align: center; line-height: 2.5rem; color: white; background: rgba(0,0,0,0.1); border-radius: 2.5rem;">End↓</div></a>
<main id="main-doc">
	<section id="Introduction" class="main-section">
		<header>
			<h3>Introduction</h3>
		</header>
		<article>
			<p>I made some shapes using only CSS codes, here are some of the features that they share:</p>
			<p>
				<ol>
					<li>They are all DIV+CSS structured</li>
					<li>They are compatible with mobile devices</li>
					<li>They are compatible with most browsers</li>
					<li>They all use persentage inside the shapes, so you can easily change their size by specify their outer width and height</li>
					<li></li>
				</ol>
			</p>
		<p>Hope you will enjoy them.</p>
		</article>
	</section>
	<hr>
	<section id="Pure_CSS_heart" class="main-section">
		<header>
			<h3>Pure CSS heart</h3>
		</header>
		<article>
			<div class="heartOuter">
				<div class="heartInner">
					<div class="heartSquare">
					</div>
					<div class="heartHalfCircle1">
					</div>
					<div class="heartHalfCircle2">
					</div>
				</div>
			</div>
			<p>HTML part</p>
<code><pre>  &lt;div class="heartOuter"&gt;
    &lt;div class="heartInner"&gt;
      &lt;div class="heartSquare"&gt;
      &lt;/div&gt;
      &lt;div class="heartHalfCircle1"&gt;
      &lt;/div&gt;
      &lt;div class="heartHalfCircle2"&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
</pre></code>
<p>CSS part</p>
<code><pre>  /* css heart start */
  .heartOuter{
    position: relative;
    margin: 0px auto;
    <span style="color: red;">/* change size start */</span>
    width: 200px;
    height: 200px;
    <span style="color: red;">/* change size end */</span>
  }
  .heartInner{
    position: absolute;
    top: 4%;
    left: 12.5%;
    width: 75%;
    height: 75%;
    transform: rotate(-45deg);
  }
  .heartSquare, .heartHalfCircle1, .heartHalfCircle2{
    position: absolute;
    background: red;
  }
  .heartSquare{
    top: 25%;
    left: 0px;
    width: 75%;
    height: 75%;
  }
  .heartHalfCircle1, .heartHalfCircle2{
    width: 75%;
    height: 75%;
  }
  .heartHalfCircle1{
    top: -15%;
    left: 0px;
    border-radius: 100% 100% 0 0;
    background: red;
  }
  .heartHalfCircle2{
    top: 25%;
    left: 40%;
    border-radius: 0 100% 100% 0;
  }
  /* css heart end */
</pre></code>
		</article>
	</section>
	<hr>
	<section id="8-tooth_CSS_gear" class="main-section">
		<header>
			<h3>8-tooth CSS gear</h3>
		</header>
		<article>
			<div class="gearOuter">
				<div class="gearCircle"></div>
				<div class="tooth1"></div>
				<div class="tooth2"></div>
				<div class="tooth3"></div>
				<div class="tooth4"></div>
				<div class="tooth5"></div>
				<div class="tooth6"></div>
				<div class="tooth7"></div>
				<div class="tooth8"></div>
			</div>
			<p>HTML part</p>
<code><pre>  &lt;div class="gearOuter"&gt;
    &lt;div class="gearCircle"&gt;&lt;/div&gt;
    &lt;div class="tooth1"&gt;&lt;/div&gt;
    &lt;div class="tooth2"&gt;&lt;/div&gt;
    &lt;div class="tooth3"&gt;&lt;/div&gt;
    &lt;div class="tooth4"&gt;&lt;/div&gt;
    &lt;div class="tooth5"&gt;&lt;/div&gt;
    &lt;div class="tooth6"&gt;&lt;/div&gt;
    &lt;div class="tooth7"&gt;&lt;/div&gt;
    &lt;div class="tooth8"&gt;&lt;/div&gt;
  &lt;/div&gt;
</pre></code>
<p>CSS part</p>
<code><pre>  /*eight-tooth gear CSS start*/
  .gearOuter{
    position: relative;
    <span style="color: red;">/*change size start*/</span>
    width: 300px;
    height: 300px;
    <span style="color: red;">/*change size end*/</span>
    margin: 0px auto;
  }
  .gearCircle{
    position: absolute;
    top: 16.67%;
    left: 16.67%;
    height: 33.33%;
    width: 33.33%;
    <span style="color: red;">/*change border width start*/</span>
    border: 50px solid gray;
    <span style="color: red;">/*border-width must be 1/6 of outer box</span>
      <span style="color: red;">border-width cannot be percentage</span>
    <span style="color: red;">/*change border width end*/</span>
    border-radius: 100%;
  }
  .tooth1, .tooth2, .tooth3, .tooth4, .tooth5, .tooth6, .tooth7, .tooth8{
    position: absolute;
    background: gray;
    border-radius: 20%;
  }
  .tooth1{
    top: 8.5%;
    left: 41.667%;
    width: 16.67%;
    height: 16.67%;
  }
  .tooth2{
    top: 41.667%;
    left: 8.5%;
    width: 16.67%;
    height: 16.67%;
  }
  .tooth3{
    transform:rotate(45deg);
    top: 18%;
    left: 18%;
    width: 16.67%;
    height: 16.67%;
  }
  .tooth4{
    transform:rotate(-45deg);
    top: 18%;
    right: 18%;
    width: 16.67%;
    height: 16.67%;
  }
  .tooth5{
    bottom: 8.5%;
    right: 41.667%;
    width: 16.67%;
    height: 16.67%;
  }
  .tooth6{
    top: 41.667%;
    right: 8.5%;
    width: 16.67%;
    height: 16.67%;
  }
  .tooth7{
    transform:rotate(45deg);
    bottom: 18%;
    left: 18%;
    width: 16.67%;
    height: 16.67%;
  }
  .tooth8{
    transform:rotate(-45deg);
    bottom: 18%;
    right: 18%;
    width: 16.67%;
    height: 16.67%;
  }
  /*eight-tooth gear CSS end*/
</pre></code>
		</article>
	</section>
	<hr>
	<section id="CSS_tomato_consisted_of_circle_and_pentagram" class="main-section">
		<header>
			<h3>CSS tomato consisted of circle and pentagram</h3>
		</header>
		<article>
			<div class="tomato-container">
				<div class="tomato-circle">
					<div class="tomato-circle-inner">
						<div class="tomato-mask1"></div>
						<div class="tomato-mask2"></div>
						<div class="tomato-mask3"></div>
						<div class="tomato-mask4"></div>
						<div class="tomato-mask5"></div>
					</div>
				</div>
			</div>
		<p>HTML part</p>
<code><pre>  &lt;div class="tomato-container"&gt;
    &lt;div class="tomato-circle"&gt;
      &lt;div class="tomato-circle-inner"&gt;
        &lt;div class="tomato-mask1"&gt;&lt;/div&gt;
        &lt;div class="tomato-mask2"&gt;&lt;/div&gt;
        &lt;div class="tomato-mask3"&gt;&lt;/div&gt;
        &lt;div class="tomato-mask4"&gt;&lt;/div&gt;
        &lt;div class="tomato-mask5"&gt;&lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
</pre></code>
<p>CSS part</p>
<code><pre>  /* css tomato start */
  .tomato-container{
    margin: 20px auto;
    <span style="color: red;">/* change size start */</span>
    width: 200px;
    height: 200px;
    <span style="color: red;">/* change size end */</span>
  }
  .tomato-circle{
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 100%;
    background: darkgreen;
    transform: rotate(-30deg);
    overflow: hidden;
  }
  .tomato-circle-inner{
    position: absolute;
    top: 17%;
    left: 13%;
    margin: 0px auto;
    width: 100%;
    height: 100%;
    transform: rotate(-13deg);
  }
  .tomato-mask1, .tomato-mask2, .tomato-mask3, .tomato-mask4, .tomato-mask5{
    position: absolute;
    background: red;
  }
  .tomato-mask1{
    top: 25%;
    left: -10%;
    width: 60%;
    height: 100%;
    transform: skewy(20deg) rotate(0deg);
  }
  .tomato-mask2{
    top: -74%;
    left: -50%;
    width: 100%;
    height: 100%;
    transform: skewy(-10deg) rotate(0deg);
  }
  .tomato-mask3{
    top: 58%;
    left: 30%;
    width: 100%;
    height: 100%;
    transform: skewy(-20deg) rotate(36deg);
  }
  .tomato-mask4{
    top: -50%;
    left: 40%;
    width: 50%;
    height: 50%;
    transform: skewy(45deg) rotate(40deg);
  }
  .tomato-mask5{
    top: -13%;
    right: -29%;
    width: 50%;
    height: 50%;
    transform: skewx(10deg) skewy(-48deg) rotate(-15deg);
  }
  /* css tomato end */
</pre></code>
		</article>
	</section>
	<hr>
	<section id="CSS_solid_pentagram" class="main-section">
		<header>
			<h3>CSS solid pentagram</h3>
		</header>
		<article>
			<div class="solid-pentagram-container">
				<div class="solid-pentagram-outer">
					<div class="solid-pentagram-inner">
						<div class="solid-triangle-outer-1">
							<div class="solid-triangle-inner"></div>
						</div>
						<div class="solid-triangle-outer-2">
							<div class="solid-triangle-inner"></div>
						</div>
						<div class="solid-triangle-outer-3">
							<div class="solid-triangle-inner"></div>
						</div>
					</div>
				</div>
			</div>
		<p>HTML part</p>
<code><pre>  &lt;div class="solid-pentagram-container"&gt;
    &lt;div class="solid-pentagram-outer"&gt;
      &lt;div class="solid-pentagram-inner"&gt;
        &lt;div class="solid-triangle-outer-1"&gt;
          &lt;div class="solid-triangle-inner"&gt;&lt;/div&gt;
        &lt;/div&gt;
        &lt;div class="solid-triangle-outer-2"&gt;
          &lt;div class="solid-triangle-inner"&gt;&lt;/div&gt;
        &lt;/div&gt;
        &lt;div class="solid-triangle-outer-3"&gt;
          &lt;div class="solid-triangle-inner"&gt;&lt;/div&gt;
        &lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
</pre></code>
<p>CSS part</p>
<code><pre>.solid-pentagram-container{
  <span style="color: red;">/* change size start */</span>
  width: 300px;
  height: 300px;
  <span style="color: red;">/* change size end */</span>
  border-radius: 100%;
  border: red solid 5px; 
}
.solid-pentagram-outer{
  position: relative;
  left: 10%;
  width: 77%;
  height: 77%;
}
.solid-pentagram-inner{
  position: relative;
  width: 100%;
  height: 100%;
}
.solid-triangle-outer-1, .solid-triangle-outer-2, .solid-triangle-outer-3{
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.solid-triangle-outer-1{
  top: -2.5%;
  left: -25%;
  transform: rotate(-36deg);
}
.solid-triangle-outer-2{
  top: -16%;
  left: 10%;
  transform: rotate(36deg);
}
.solid-triangle-outer-3{
  top: 13%;
  right: -34.5%;
  transform: rotate(108deg);
}
.solid-triangle-inner{
  position: absolute;
  top: 122.5%;
  right: 0%;
  width: 200%;
  height: 100%;
  background-color: red;
  transform: rotate(108deg) skewx(54deg);
}
</pre></code>
		</article>
	</section>
	<hr>
	<section class="main-section" id="CSS_hollow_pentagram">
		<header>
			<h3>CSS hollow pentagram</h3>
		</header>
		<article>
			<div class="pentagram-container">
				<div class="pentagram-outer">
					<div class="pentagram-inner">
						<div class="pentagram-01"></div>
						<div class="pentagram-02"></div>
						<div class="pentagram-03"></div>
						<div class="pentagram-04"></div>
						<div class="pentagram-05"></div>
					</div>
				</div>
			</div>
			<p>HTML part</p>
<code><pre>  &lt;div class="pentagram-container"&gt;
    &lt;div class="pentagram-outer"&gt;
      &lt;div class="pentagram-inner"&gt;
        &lt;div class="pentagram-01"&gt;&lt;/div&gt;
        &lt;div class="pentagram-02"&gt;&lt;/div&gt;
        &lt;div class="pentagram-03"&gt;&lt;/div&gt;
        &lt;div class="pentagram-04"&gt;&lt;/div&gt;
        &lt;div class="pentagram-05"&gt;&lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
</pre></code>
<p>CSS part</p>
<code><pre>.pentagram-container{
  <span style="color: red;">/* change size start */</span>
  width: 200px;
  height: 200px;
  <span style="color: red;">/* change size end */</span>
}
.pentagram-outer{
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 100%;
  overflow: hidden;
}
.pentagram-inner{
  position: relative;
  width: 100%;
  height: 100%;
}
.pentagram-01, .pentagram-02, .pentagram-03, .pentagram-04, .pentagram-05{
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: red;
}
.pentagram-01{
  top: -66%;
  left: 45%;
  transform: skewx(18deg);
}
.pentagram-02{
  top: -66%;
  right: 45%;
  transform: skewx(-18deg);
}
.pentagram-03{
  bottom: -22.5%;
  right: 75.5%;
  transform: rotate(18deg) skewy(18deg);
}
.pentagram-04{
  bottom: -22.5%;
  left: 75.5%;
  transform: rotate(-18deg) skewy(-18deg);
}
.pentagram-05{
  width: 100%;
  height: 100%;
  bottom: -80%;
  left: 2%;
  transform: rotate(54deg) skewy(-18deg);
}
</pre></code>
		</article>
	</section>
	<hr>
<section>
	<p id="fin" style="text-align: center;">---Fin---</p>
</section>
</main>




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CSS 

              
                *{
	-webkit-tap-highlight-color: transparent;
}
body{
	margin: 0px;
	min-width: 320px;
	background: #ccf1f5;
}
h2, h3{
	text-shadow: 0px 1px 1px yellowgreen;
}
pre{
	margin: 20px;
	max-width: 780px;
	background: silver;
	overflow-x: auto;
}
hr{
	margin: 10px;
	border: none;
	border-top: 1px black dashed;
	max-width: 800px;
}

#nav-icon{
	position: fixed;
	top: 8px;
	right: 8px;
	width: 30px;
	height: 30px;
	font-size: 24px;
	line-height: 30px;
	text-align: center;
	border-radius: 5px;
	background: white;
	box-shadow: 0px 1px 2px gray;
	cursor: pointer;
	z-index: 1000;
	display: none;
}
#nav-mask{
	position: fixed;
	top: 0px;
	width: 100%;
	height: 100%;
	background: gray;
	opacity: 0.5;
	z-index: 998;
	display: none;
}
nav{
	position: fixed;
	width: 240px;
	height: 100%;
	border-right: 2px solid silver;
	background: #ccf1f5;
	display: flex;
	flex-direction: column;
	z-index: 999;
}
.nav-link{
	text-decoration: none;
	color: darkblue;
	text-shadow: 0px 1px 1px yellowgreen;
}
.nav-link:hover{
	color: orange;
}
nav ul{
	list-style: none;
	margin: 0px 0px 0px 10px;
	padding-left: 0px;
	padding-right: 10px;
	overflow-x: hidden;
}
nav li{
	margin-bottom: 5px;
	border-bottom: 1px solid gray;
}
header{
	max-width: 800px;
}
nav header{
	margin: 0px 10px;
}
main{
	margin-left: 240px;
	overflow: hidden;
}
section{
	margin: 0px 10px;
	max-width: 800px;
}
.gearOuter{
	width: 200px;
	height: 200px;
}
.gearCircle{
	border-width: 33.33px;
}


@media all and (max-width: 768px){
	#nav-icon{
		display: block;
	}
	nav{
		left: -240px;
	}
	main{
		margin-left: 0px;
	}
}

@media all and (max-width: 425px){
	pre{
		margin: 20px 0px;
	}
}
!

JS 

              
                $(document).ready(function(){
	$("#nav-icon").click(function(){
			if($("nav").position().left == -240){
					$("nav").animate({"left":'0'},"slow");
					$("#nav-mask").css("display","block");
			}else{
					$("nav").animate({"left":'-240'},"slow");
					$("#nav-mask").css("display","none");
			}
	});

	$("#nav-mask").click(function(){
		if($(window).width() < 752){
			$("nav").animate({"left":'-240'},"slow");
			$("#nav-mask").css("display","none");
		}else{
			$("#nav-mask").css("display","none");
		}
	});
	
	$(window).resize(function(){
		if($(window).width() < 752){
			//垂直方向滚动条宽度为16px，需要减掉这个宽度
			$("nav").css("left",-240);
		}else{
			$("nav").css("left",0);
		}
	});
	
	$("#navbar a").click(function(){
		if($(window).width() < 752){
			//垂直方向滚动条宽度为16px，需要减掉这个宽度
			$("nav").animate({"left":'-240'},"slow");
			$("#nav-mask").css("display","none");
		}
	});
});
!
999px

Console