h2#danraku2{

}

h3#danraku3｛
position: relative;
padding-left: 25px;
}

h3: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);
}
h3:after {
position: absolute;
content: '';
bottom: -3px;
left: 10px;
width: 100%;
border-bottom: solid 3px rgb(119, 195, 223);

｝