h2.midashi{
    margin: 0 0 1.5em;
    padding: 0.8em;
    background: #87cefa;
    color: #fff;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
}

h3.midashi {
    margin: 0 0 1.5em;
    padding: 0.3em;
    border-left: 7px solid #87cefa;
    border-bottom: 2px dashed #87cefa;
}

h4.midashi {
background: linear-gradient(transparent 70%, #87cefa 70%);
}