.collapsible {
    background-color: #333333;
    color: #cebfaf;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: solid 1px #465052;
    text-align: left;
    outline: none;
}

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

.collapsible:after {
    content: '\002B';
    color: #06c;
    font-weight: bold;
    float: right;
    margin-left: 5px;
}

.active:after {
    content: '\2212';
}

.collapsible-content {
    padding: 0 18px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
    background-color: #2e2e2e;
    color: #dbdbdb;
}