.toggle {
  padding-bottom: 12px;
}

.toggle .header {
    display: block;
    clear: both;
/*    background-color:#f3f6f6;
    box-sizing: border-box;
    margin: 0;
    padding: 12px 12px;
    overflow: auto;
    white-space: pre;
    font-size: 14px;
    line-height: 1.4; */
}

.toggle .header:after {
    content: " ▶";
}

.toggle .header.open:after {
    content: " ▼";
}

div.btn>p { margin: 0; }