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HTML 

              
                <div><a id="link" href="https://naruhodo.repop.jp/css-heading-tag-design/" target="_blank">Heading tag design CSS</a></div>
<h2 class="BB1">下線付き見出しデザイン1</h2>
<h2 class="BB2">下線付き見出しデザイン2</h2>
<h2 class="BB3">下線付き見出しデザイン3</h2>
<h2 class="BB4">下線付き見出しデザイン4</h2>
<h2 class="BB5">下線付き見出しデザイン5</h2>
<h2 class="BL1">横線付き見出しデザイン1</h2>
<h2 class="BL2">横線付き見出しデザイン2</h2>
<h2 class="BL3">横線付き見出しデザイン3</h2>
<h2 class="B1">枠線付き見出しデザイン1</h2>
<h2 class="B2">枠線付き見出しデザイン2</h2>
<h2 class="B3">枠線付き見出しデザイン3</h2>
<h2 class="FT1">最初の文字を大きくした見出しデザイン1</h2>
<h2 class="FT2">最初の文字を大きくした見出しデザイン2</h2>
<h2 class="FT3">最初の文字を大きくした見出しデザイン3</h2>
<h2 class="RBG1">薄い背景色の見出しデザイン1</h2>
<h2 class="RBG2">薄い背景色の見出しデザイン2</h2>
<h2 class="RBG3">薄い背景色の見出しデザイン3</h2>
<h2 class="RBG4">薄い背景色の見出しデザイン4</h2>
<h2 class="RBG5">薄い背景色の見出しデザイン5</h2>
<h2 class="RBG6">薄い背景色の見出しデザイン6</h2>
<h2 class="RBG7">薄い背景色の見出しデザイン7</h2>
<h2 class="DBG1">濃い背景色の見出しデザイン1</h2>
<h2 class="DBG2">濃い背景色の見出しデザイン2</h2>
<h2 class="DBG3">濃い背景色の見出しデザイン3</h2>
<h2 class="DBG4">濃い背景色の見出しデザイン4</h2>
<h2 class="DBG5">濃い背景色の見出しデザイン5</h2>
<h2 class="DBG6">濃い背景色の見出しデザイン6</h2>
<h2 class="DBG7">濃い背景色の見出しデザイン7</h2>
<h2 class="balloon1">吹き出しの見出しデザイン1</h2>
<h2 class="balloon2">吹き出しの見出しデザイン2</h2>
<h2 class="gra1">グラデーションの見出しデザイン1</h2>
<h2 class="gra2">グラデーションの見出しデザイン2</h2>
<h2 class="gra3">グラデーションの見出しデザイン3</h2>
<h2 class="gra4">グラデーションの見出しデザイン4</h2>
<h2 class="gra5">グラデーションの見出しデザイン5</h2>
<h2 class="star1">星マークの見出しデザイン1</h2>
<h2 class="star2">星マークの見出しデザイン2</h2>
<h2 class="dia1">ダイヤマークの見出しデザイン1</h2>
<h2 class="dia2">ダイヤマークの見出しデザイン2</h2>
<h2 class="square1">四角マークの見出しデザイン1</h2>
<h2 class="square2">四角マークの見出しデザイン2</h2>
<h2 class="heart1">ハートマークの見出しデザイン1</h2>
<h2 class="heart2">ハートマークの見出しデザイン2</h2>
<h2 class="icon1">アイコンフォントを使った見出しデザイン1</h2>
<h2 class="icon2">アイコンフォントを使った見出しデザイン2</h2>
<h2 class="icon3">アイコンフォントを使った見出しデザイン3</h2>
<h2 class="icon4">アイコンフォントを使った見出しデザイン4</h2>
<h2 class="icon5">アイコンフォントを使った見出しデザイン5</h2>
<h2 class="anime1">アニメーションを使った見出しデザイン1</h2>
<h2 class="anime2">アニメーションを使った見出しデザイン2</h2>
<h2 class="anime3">アニメーションを使った見出しデザイン3</h2>
<h2 class="anime4">アニメーションを使った見出しデザイン4</h2>
<h2 class="silhouette1">シルエット画像を使った見出しデザイン1</h2>
<h2 class="silhouette2">シルエット画像を使った見出しデザイン2</h2>
!

CSS 

              
                #link{
  font-size:1em;
  margin:10px 0;
}

h2{
  border:none;
  margin:30px 0px;
	font-size:1.1em;
	color: #325A8C;
	position: relative;
}

/*
下線付き見出しサンプル1
*/
h2.BB1{
  padding: 10px;
  border-bottom:3px solid #FF9100;
}

/*
下線付き見出しサンプル2
*/
h2.BB2{
  padding: 10px;
  border-bottom:6px solid #FF9100;
}

/*
下線付き見出しサンプル3
*/
h2.BB3{
  padding: 10px;
  border-bottom: double 3px #FF9100;
}

/*
下線付き見出しサンプル4
*/
h2.BB4{
  padding: 10px;
  border-bottom: dashed 2px #FF9100;
}

/*
下線付き見出しサンプル5
*/
h2.BB5{
  padding: 10px;
  border-bottom: dashed 4px #FF9100;
}

/*
横線付き見出しサンプル1
*/
h2.BL1{
  padding: 10px;
border-left:5px solid #FF9100;
}

/*
横線付き見出しサンプル2
*/
h2.BL2{
  padding: 10px;
border-left:5px double #FF9100;
}

/*
横線付き見出しサンプル3
*/
h2.BL3{
  padding: 10px;
border-left:3px dashed #FF9100;
}

/*
枠線付き見出しデザイン1
*/
h2.B1{
  padding: 10px;
  border:2px solid #FF9100;
}

/*
枠線付き見出しデザイン2
*/
h2.B2{
  padding: 10px;
  border: double 3px #FF9100;
}

/*
枠線付き見出しデザイン3
*/
h2.B3{
  padding: 10px;
  border: dashed 3px #FF9100;
}
/*
最初の文字を大きくした見出しデザイン1
*/
h2.FT1{
  padding: 0 5px;
  border-bottom:3px solid #FF9100;
}
h2.FT1:first-letter{
  font-size:2em;
}

/*
最初の文字を大きくした見出しデザイン2
*/
h2.FT2{
  padding: 0 5px;
  border-bottom:3px solid #FF9100;
}
h2.FT2:first-letter{
  font-size:2em;
  color:#FF9100;
}

/*
最初の文字を大きくした見出しデザイン3
*/
h2.FT3{
  padding: 10px;
}
h2.FT3:first-letter{
  font-size:1.8em;
  padding: 2px 10px;
  color:#FFF;
  background:#FF9100;
  border-radius:50%;
}

/*
薄い背景色の見出しデザイン1
*/
h2.RBG1{
  padding: 10px;
  background: #E0E0E0;
}

/*
薄い背景色の見出しデザイン2
*/
h2.RBG2{
  padding: 10px;
  background: #E0E0E0;
  border-left:5px solid #FF9100;
}

/*
薄い背景色の見出しデザイン3
*/
h2.RBG3{
  padding: 10px;
  background: #E0E0E0;
  border-left:5px solid #00B0FF;
  box-shadow: 4px 4px 4px rgba(0, 0, 0, 0.9);
}

/*
薄い背景色の見出しデザイン4
*/
h2.RBG4{
  padding: 10px;
  background: #E0E0E0;
  border: dashed 2px #777;
}

/*
薄い背景色の見出しデザイン5
*/
h2.RBG5{
  padding: 10px;
  background: #E0E0E0;
  border: dashed 2px #777;
  box-shadow: 0 0 0 4px #E0E0E0;
}

/*
薄い背景色の見出しデザイン6
*/
h2.RBG6{
  padding: 10px;
  text-align:center;
  background: #E0E0E0;
  border-radius:50%;
}

/*
薄い背景色の見出しデザイン7
*/
h2.RBG7{
  padding: 10px;
  text-align:center;
  background: #E0E0E0;
  border-radius:50%;
  box-shadow: 4px 4px 4px rgba(0, 0, 0, 0.9);
}

/*
濃い背景色の見出しデザイン1
*/
h2.DBG1{
  padding: 10px;
  color:#FFF;
  background: #777;
}

/*
濃い背景色の見出しデザイン2
*/
h2.DBG2{
  padding: 10px;
  background: #777;
  color:#FFF;
  border-left:5px solid #FF9100;
}

/*
濃い背景色の見出しデザイン3
*/
h2.DBG3{
  padding: 10px;
  background: #777;
  color:#FFF;
  border-left:5px solid #00B0FF;
  box-shadow: 4px 4px 4px rgba(0, 0, 0, 0.7);
}

/*
濃い背景色の見出しデザイン4
*/
h2.DBG4{
  padding: 10px;
  color:#FFF;
  background: #777;
  border: dashed 2px #FFF;
}

/*
濃い背景色の見出しデザイン5
*/
h2.DBG5{
  padding: 10px;
  color:#FFF;
  background: #777;
  border: dashed 2px #FFF;
  box-shadow: 0 0 0 4px #777;
}

/*
濃い背景色の見出しデザイン6
*/
h2.DBG6{
  padding: 10px;
  text-align:center;
  color:#FFF;
  background: #777;
  border-radius:50%;
}

/*
濃い背景色の見出しデザイン7
*/
h2.DBG7{
  padding: 10px;
  text-align:center;
  color:#FFF;
  background: #777;
  border-radius:50%;
  box-shadow: 4px 4px 4px rgba(0, 0, 0, 0.7);
}

/*
吹き出しの見出しデザイン1
*/
h2.balloon1{
  padding: 10px;
  background: #E0E0E0;
}

h2.balloon1:after {
	content: "";
	position: absolute;
	top: 100%;
	left: 5%;
	border: 0.5em solid transparent;
	border-top: 1.3em solid #E0E0E0;
}

/*
吹き出しの見出しデザイン2
*/
h2.balloon2{
  padding: 10px;
  padding-left: 0.5em;
  color:#FFF;
  background: #777;
}

h2.balloon2:after {
	content: ""; 
	position: absolute;
	top: 100%;
	left: 5%;
	border: 0.5em solid transparent;
	border-top: 1.3em solid #777;
}

/*
グラデーションを使った見出しデザイン1
*/
h2.gra1{
  padding: 10px;
  background: linear-gradient(to right, #FFCC80, rgba(255,255,255,0) 70%);
}
/*
グラデーションを使った見出しデザイン2
*/
h2.gra2{
  padding: 10px;
  background: linear-gradient(to right, #FF9100, rgba(255,255,255,0) 100%);
}
/*
グラデーションを使った見出しデザイン3
*/
h2.gra3{
  padding: 10px;
  padding-left: 0.5em;
  color:#FFF;
  background: linear-gradient(to right, #000, rgba(255,255,255,0) 100%);
}
/*
グラデーションを使った見出しデザイン4
*/
h2.gra4{
  padding: 10px;
}

h2.gra4::after{
	content: "";
  width:100%;
  height:6px;
	position: absolute;
	left: 0;
	bottom: 0;
  background: linear-gradient(to right, #FF9100, rgba(255,255,255,0) 100%);
}
/*
グラデーションを使った見出しデザイン5
*/
h2.gra5{
  padding: 10px;
}

h2.gra5::after{
	content: "";
  width:100%;
  height:6px;
	position: absolute;
	left: 0;
	bottom: 0;
  background: linear-gradient(to right, #000, rgba(255,255,255,0) 100%);
}

/*
星マークの見出しデザイン1
*/
h2.star1{
	position: relative;
  padding: 10px;
  padding-left:2em;
}
h2.star1::before{
	content: "★";
	color: #FF9100;
	font-size:2em;
	position: absolute;
	left: 0;
	top: -0.2em;
}

/*
星マークの見出しデザイン2
*/
h2.star2{
	position: relative;
  padding: 10px;
  padding-left:2em;
}

h2.star2::before{
	content: "★";
	color: #FF9100;
	font-size:2em;
	position: absolute;
	left: 0;
	top: -0.2em;
}

h2.star2::after{
	content: "★";
	font-size:1.5em;
	position: absolute;
	left: 0.4em;
	top: 0.3em;
	color: #E65100;
}

/*
ダイヤマークの見出しデザイン1
*/
h2.dia1{
	position: relative;
  padding: 10px;
  padding-left:2em;
}

h2.dia1::before{
	content: "◆";
	color: #FF9100;
	font-size:2em;
	position: absolute;
	left: 0;
	top: -0.1em;
}

/*
ダイヤマークの見出しデザイン2
*/
h2.dia2{
	position: relative;
  padding: 10px;
  padding-left:2em;
}

h2.dia2::before{
	content: "◇";
	color: #FF9100;
	font-size:1.9em;
	position: absolute;
	left: 0;
	top: -0.1em;
}

h2.dia2::after{
	content: "◇";
	color: #325A8C;
	font-size:1.3em;
	position: absolute;
	left: 0.4em;
	top: 0.4em;
}

/*
四角マークの見出しデザイン1
*/
h2.square1{
	position: relative;
  padding: 10px;
  padding-left:2em;
}

h2.square1::before{
	content: "■";
	color: #FF9100;
	font-size:2em;
	position: absolute;
	left: 0;
	top: -0.1em;
}

/*
四角マークの見出しデザインB
*/
h2.square2{
	position: relative;
	padding: 10px;
	padding-left:2em;
}

h2.square2::before{
	content: "■";
	font-size:1.5em;
	position: absolute;
	left: 0.1em;
	top: 0.15em;
	color: #FF9100;
}

h2.square2::after{
	content: "■";
	font-size:1.4em;
	position: absolute;
	left: 0.4em;
	top: 0.5em;
	color: #325A8C;
}

/*
ハートマークの見出しデザインA
*/
h2.heart1{
	position: relative;
  padding: 10px;
  padding-left:2em;
}

h2.heart1::before{
	content: "♥";
	color: #FF9100;
	font-size:2em;
	position: absolute;
	left: 0;
	top: -0.1em;
}

/*
ハートマークの見出しデザインB
*/
h2.heart2{
	position: relative;
  padding: 10px;
  padding-left:2em;
}

h2.heart2::before{
	content: "♡";
	color: #FF9100;
	font-size:1.8em;
	position: absolute;
	left: 0;
	top: -0.05em;
}

h2.heart2::after{
	content: "♡";
	font-size:1.1em;
	position: absolute;
	left: 0.6em;
	top: 0.6em;
	color: #325A8C;
}

/*
アイコンフォントを使った見出しデザイン1
*/
h2.icon1{
	position:relative;
  padding:10px;
  padding-left:2em;
}

h2.icon1::before{
font-family:'FontAwesome';
content:"\f0a9";
font-size:2em;
position:absolute;
left:0;
top:0.1em;
color: #FF9100;
}

/*
アイコンフォントを使った見出しデザイン2
*/

h2.icon2{
	position:relative;
  padding:10px;
  padding-left:2.5em;
  background:#FF8F00;
  color:#FFF;
}

h2.icon2::before{
font-family:'FontAwesome';
content:"\f044";
font-size:1.8em;
position:absolute;
left:0.15em;
top:0.25em;
color:#FFF;
}

/*
アイコンフォントを使った見出しデザイン3
*/
h2.icon3{
	position:relative;
  padding:10px;
  padding-left:2em;
}

h2.icon3::before{
font-family:'FontAwesome';
content:"\f0a4";
font-size:1.9em;
position:absolute;
left:0;
top:0.1em;
color: #FF9100;
}

/*
アイコンフォントを使った見出しデザイン4
*/
h2.icon4{
	position:relative;
  padding:10px;
  padding-left:2em;
}

h2.icon4::before{
font-family:'FontAwesome';
content:"\f058";
font-size:2em;
position:absolute;
left:0;
top:0.1em;
color: #FF9100;
}

/*
アイコンフォントを使った見出しデザイン5
*/
h2.icon5{
	position:relative;
  padding:10px;
  padding-left:2em;
  z-index: 1;
}

h2.icon5::before{
font-family:'FontAwesome';
content:"\f1d7";
font-size:4em;
position:absolute;
left:0;
top:-0.15em;
color: #FFB74D;
z-index:-1;
}

/*
アニメーションを使った見出しデザイン1
*/
h2.anime1{
  padding: 10px;
  background: #FFCC80;
  animation: anime1_anime 5s reverse infinite;
}

@keyframes anime1_anime{
0% { background: #FFCC80; }
50% { background: #E1F5FE; }
}

/*
アニメーションを使った見出しデザイン2
*/
h2.anime2{
	position: relative;
  padding: 10px;
  padding-left:2em;
}

h2.anime2::before{
	content: "♥";
	color: #FF9100;
	font-size:1.8em;
	position: absolute;
	left: 0;
	top: -0.05em;
  animation: anime2_anime 3s reverse infinite;
}

@keyframes anime2_anime{
80% { transform: scale(1); }
90% { transform: scale(1.3); }
100% { transform: scale(1); }
}

/*
アニメーションを使った見出しデザイン3
*/
h2.anime3{
	position: relative;
  padding: 10px;
  padding-left:2em;
}

h2.anime3::before{
	content: "♥";
	color: #FF9100;
	font-size:1.8em;
	position: absolute;
	left: 0;
	top: -0.05em;
  animation: anime3_anime 3s reverse infinite;
}

@keyframes anime3_anime{
100% {
  transform: rotateY(360deg);
  -webkit-transform: rotateY(360deg);
  }
}

/*
アニメーションを使った見出しデザイン4
*/
h2.anime4{
	position: relative;
  padding: 10px;
  padding-left:2em;
}

h2.anime4::before{
	content: "♥";
	color: #FF9100;
	font-size:1.8em;
	position: absolute;
	left: 0;
	top: -0.05em;
  animation: anime4_anime 3s infinite;
}

@keyframes anime4_anime{
0% { color: #FF9100; }
50% { color: #81D4FA; }
100% { color: #FF9100; }
}

/*
シルエット画像を使った見出しデザイン1
*/
h2.silhouette1{
	position:relative;
  color:#FF9100;
  padding:50px;
  padding-left:2em;
  background-image:url("https://naruhodo.repop.jp/wp-content/uploads/2018/02/mario.png");
  background-size:contain;
  background-repeat: no-repeat;
}

/*
シルエット画像を使った見出しデザイン2
*/
h2.silhouette2{
	position:relative;
  color:#FF9100;
  padding:90px 40px 30px 0px;
  padding-left:2em;
  background-image:url("https://naruhodo.repop.jp/wp-content/uploads/2018/02/cat.png");
  background-size:contain;
  background-repeat: no-repeat;
}

h2.silhouette2::after{
	content: "";
  width:100%;
  height:6px;
	position: absolute;
	left: 0;
	bottom: 0;
  background: linear-gradient(to right, #000, rgba(255,255,255,0) 100%);
}
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JS
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999px

Console