div.spoiler_box {
padding: 0;
border: 1px solid #bc7d7d;
}
.spoiler_box .NavHead {
font-size: 1.2em;
font-weight: bold;
background-color: #f1d0d0;
}
.spoiler_box .NavContent {
text-align: left;
border-top: 1px solid #ccc;
padding: 1em;
}
@media all and (max-width:720px) {
.spoiler_box .NavContent {
display: block !important;
}
}