/* Outer container of collapsible content */
#collapsible_section {
    margin: 20px 10px 0 0;
    padding: 0;
}

/* Style the button that is used to open and close the collapsible content */
#collapsible_section .collapsible {
    background-color: #e6e6e6;
    color: #444;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 20px;
}

/* Add a background color to the button if it is clicked on (add the .active class with JS)... */
.active {
    background-color: #a5a5a5;
}

/* ... and when you move the mouse over it (hover) */
.collapsible:hover {
    background-color: #ccc;
}

/* Style the collapsible content. Note: hidden by default */
.content {
    margin: 0;
    padding-top: 6px;
    padding-bottom: 6px;
    padding-right: 18px;
    padding-left: 18px;
    display: none;
    overflow: hidden;
    background-color: #f7f7f7;
}

/* Change content list space */
.content li {
    margin-top: 4px;
    margin-bottom: 4px;
}

.collapsible:after {
    content: '\02795'; /* Unicode character for "plus" sign (+) */
    font-size: 13px;
    color: white;
    float: right;
    margin-left: 5px;
}

.active:after {
    content: "\2796"; /* Unicode character for "minus" sign (-) */
}