h2 {
position: relative;
padding-left: 25px;
}

h2:before {
position: absolute;
content: '';
bottom: -3px;
left: 0;
width: 0;
height: 0;
border: none;
border-left: solid 15px transparent;
border-bottom: solid 15px rgb(119, 195, 223);
}
h2:after {
position: absolute;
content: '';
bottom: -3px;
left: 10px;
width: 100%;
border-bottom: solid 3px rgb(119, 195, 223);
}

h3{
color: #1AE0DD;/*文字色*/
padding: 0.5em 0;/*上下の余白*/
border-top: solid 3px #364e96;/*上線*/
border-bottom: solid 3px #364e96;/*下線*/
}

h4{
position: relative;
background: #dfefff;
box-shadow: 0px 0px 0px 5px #dfefff;
border: dashed 2px white;
padding: 0.2em 0.5em;
color: #454545;
}

h4:after{
position: absolute;
content: '';
left: -7px;
top: -7px;
border-width: 0 0 15px 15px;
border-style: solid;
border-color: #fff #fff #a8d4ff;
box-shadow: 1px 1px 1px rgba(0, 0, 0, 0.15);
}

marker{
background: linear-gradient(transparent 60%, #7fffd4 50%);
}