h2#danraku2 {
background: linear-gradient(transparent 70%, #a7d6ff 70%);
}
h3#danraku3 {
border-bottom: solid 3px #cce4ff;
position: relative;
}

h3#danraku3:after {
position: absolute;
content: " ";
display: block;
border-bottom: solid 3px #5472cd;
bottom: -3px;
width: 20%;
}

h4#danraku4 {
border-bottom: solid 3px black;
}