.bb-spoiler {
    margin: 8px 0;
    border: 1px solid rgba(128, 128, 128, .45);
    border-radius: 4px;
    overflow: hidden;
}

.bb-spoiler-toggle {
    display: block;
    width: 100%;
    min-height: 30px;
    padding: 6px 10px;
    border: 0;
    background: rgba(0, 0, 0, .35);
    color: inherit;
    cursor: pointer;
    font-weight: 700;
    text-align: left;
}

.bb-spoiler-toggle:before {
    content: "+";
    display: inline-block;
    width: 18px;
    font-weight: 700;
}

.bb-spoiler.is-open .bb-spoiler-toggle:before {
    content: "-";
}

.bb-spoiler-content {
    display: none;
    padding: 10px;
}

.bb-spoiler.is-open .bb-spoiler-content {
    display: block;
}