section.sources {
  margin: 1.5em 0;
  
}

.sources-collapsible {
    background-color: #777;
    color: white;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
    display: flex;
    justify-content: space-between;
}

.sources-collapsible.active,
.sources-collapsible:hover {
    background-color: #555;
}

.sources-collapsible:after {
    content: '\002B';
    color: white;
    font-weight: bold;
    float: right;
    margin-left: 5px;
}

.sources-collapsible.active:after {
    content: "\2212";
}

.sources-content {
    padding: 0 18px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
    background-color: #f1f1f1;
    text-align: justify;
}

.sources-hangindent {
    padding-left: 0.5em;
    text-indent: -0.5em;
}

.sources-textindent {
  padding-left: 0.5em;
}

h2 { 
  font-size: 1em;
  font-weight: normal;
  margin: 0;
}

h3 {
  margin-top: 1.5em;
}