Pure HTML5+CSS3 to make a birthday cake (code is easy to understand)
Without further ado, let me show you the renderings first: 
The cake is divided into three parts, the bottom cake, the top cake and the candle part. The layout structure of HTML is also laid out according to these three parts. The other is to use CSS positioning and CSS3 rotate, inner and outer shadows and other effects to adjust the styles of some DOM elements. It's relatively simple, I believe all coders understand it.
I won’t go into details about the others.
The complete HTML code and CSS code are given below
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
.birthday .container{
width:600px;
height:600px;
margin:0px auto;
background: #fafafa;
border-radius:5px;
position: relative;
}
/**
** 顶层的
**/
.birthday .top-one{
position: absolute;
width:280px;
height: 280px;
bottom: 200px;
left:160px;
}
.birthday .top-one .bottom{
position: absolute;
width:280px;
height: 280px;
bottom:-30px;
border:1px solid #3e2001;
border-radius: 140px;
transform: rotateX(60deg);
z-index: 4;
background: #3e2001;
box-shadow: 0px 0px 20px #3e2001;
}
.birthday .top-one .top{
position: absolute;
width:280px;
height: 280px;
top:-50px;
border-radius: 140px;
background: #FFFFFF;
transform: rotateX(60deg);
box-shadow: 2px 2px 20px #b7b7b7;
z-index: 6;
background: -webkit-repeating-radial-gradient(circle, #783d01, #3e2001 10px, #914909 10px,white 20px);
background: -moz-repeating-radial-gradient(circle, #783d01, #3e2001 10px,#914909 10px,white 20px);
}
.birthday .top-one .side{
position: absolute;
top:95px;
width:280px;
height: 70px;
border:1px solid #3e2001;
border-top-width: 0px;
border-bottom-width: 0px;
background: #FFFFFF;
z-index: 5;
background: #3e2001;
}
/**
** 底层的
**/
.birthday .bottom-one{
position: absolute;
width:400px;
height: 400px;
bottom: 0px;
left:100px;
}
.birthday .bottom-one .bottom{
position: absolute;
width:400px;
height: 400px;
bottom:-30px;
border:1px solid #914909;
border-radius: 200px;
transform: rotateX(60deg);
box-shadow: 2px 2px 20px #914909;
z-index: 1;
background: #3e2001;
overflow: hidden;
}
.birthday .bottom-one .line{
position: absolute;
width:400px;
height: 400px;
border-radius: 200px;
z-index: 1;
}
.birthday .bottom-one .line1{
bottom: 30px;
border:5px solid #783d01;
left:-5px;
z-index: 1;
}
.birthday .bottom-one .top{
position: absolute;
width:400px;
height: 400px;
top:-100px;
border:1px solid #3e2001;
border-radius: 200px;
background: #FFFFFF;
transform: rotateX(60deg);
z-index: 3;
background: #783d01;
box-shadow: inset 0px 0px 20px #3e2001;
}
.birthday .bottom-one .side{
position: absolute;
top:100px;
width:400px;
height: 130px;
border:1px solid #3e2001;
border-top-width: 0px;
border-bottom-width: 0px;
background: #3e2001;
z-index: 2;
}
/**
** 底层的文字
**/
.birthday .flower{
position: relative;
text-align: justify;
z-index: 9;
top:200px;
font-size: 32px;
font-family: "Helvetica Neue", "Noto Sans CJK SC", "Source Han Sans CN";
color:#FFFFFF;
font-weight: bold;
}
.birthday .flower:after{
content:"";
display:inline-block;
position: relative;
width:100%;
}
.birthday .flower i{
position: relative;
width:80px;
line-height: 80px;
display: inline-block;
border-radius: 50%;
border:2px solid #783d01;
text-align: center;
}
/**
** 顶层的文字
**/
.birthday .top-one .text{
width:100%;
text-align: center;
position: absolute;
top:165px;
z-index: 9;
margin:0px auto;
font-size: 30px;
color:#FFFFFF;
transform: rotateX(60deg) skew(10deg,20deg);
}
/**
** 蜡烛
**/
.birthday .candle{
width:10px;
height:80px;
margin:0px auto;
position: absolute;
left:295px;
top:130px;
z-index: 9;
}
.birthday .candle .body{
width:10px;
height:70px;
margin:0px auto;
background: red;
border-bottom-width: 0px;
}
.birthday .candle .top{
width:10px;
height: 10px;
border-radius: 5px;
transform: rotateX(60deg);
position: relative;
top:5px;
background: red;
}
.birthday .candle .bottom{
width:10px;
height: 10px;
border-radius: 5px;
transform: rotateX(60deg);
position: relative;
bottom:5px;
background: red;
box-shadow: 1px 1px 10px red;
}
.birthday .candle .fire{
position: absolute;
width:6px;
height: 6px;
left:2px;
transform: rotate(45deg);
background: #ffd507;
box-shadow: 0px 0px 20px #ffff00, 2px 2px 10px red;
}
</style>
</head>
<body>
<p class="birthday">
<p class="container">
<p class="candle">
<p class="fire"></p>
<p class="top"></p>
<p class="body"></p>
<p class="bottom"></p>
</p>
<p class="top-one">
<p class="top"></p>
<p class="side"></p>
<p class="bottom"></p>
<p class="text">
Happy Birthday
</p>
</p>
<p class="bottom-one">
<p class="top"></p>
<p class="side"></p>
<p class="bottom">
<p class="line line1"></p>
</p>
<p class="flower">
<i style="top:-20px;transform: rotateY(50deg)">生</i>
<i style="top:15px;transform: rotateY(30deg)">日</i>
<i style="top:15px;transform: rotateY(30deg)">快</i>
<i style="top:-20px;transform: rotateY(50deg)">乐</i>
</p>
</p>
</p>
</p>
</body>
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