.help-list {
    display: flex;
    flex-flow: row wrap;
    max-width: 992px;
    width: 100%;
    margin: auto;
}
.help-list > * {
    /* flex: 1 1 calc(50% - 1.6em); */
    flex: 1 1 calc(100% - 1.6em);
    margin: 0 0.8em 1.5em;
}

.help-title {
    margin: 1.8em auto 0.6em;
}

button.help-accordion {
    background-color: #eee;
    color: #444;
    cursor: pointer;
    padding: 1em 0.6em;
    width: 100%;
    height: auto;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
    transition: 0.4s;
}

.help-accordion:before {
    content: '+';
    font-size: 20px;
    font-weight: bold;
    margin-right: 10px;
    position: relative;
    top: 2px;
}

.help-accordion:hover {
    background-color: #ccc;
}

.help-accordion.active {
    background-color: #19212c; /* #6296cd */
    color: #fcfcfc;
}

.help-accordion.active:before {
    content: '-';
    font-size: 20px;
    font-weight: bold;
    margin-right: 10px;
    position: relative;
    top: 2px;
}

.help-panel {
    /* display: none; */
    opacity: 0;
    height: 0px;
    padding: 0;
    background-color: white;
    overflow: hidden;
    text-align: center;
    transition: 0.7s;
}

.help-panel.show {
    opacity: 1;
    height: 480px;
    margin: 1.6em 0.6em;
}

.help-panel iframe {
    width: 100%;
    min-width: 560px;
    min-height: calc(315px * 1.5);
    max-width: 860px;
    /* max-height: calc(820px / 1.5); */
}

/* @responsive */
@media (max-width: 767px) {
    .help-list {
        max-width: 100%;
        flex-direction: column;
        padding: 0 1em;
        margin-left: -1em;
    }

    .help-list > * {
        flex: 1 1 100%;
        margin: 0 0 1.5em;
    }

    .help-title {
        font-size: 18px;
        margin: 1em auto 0.5em;
    }

    button.help-accordion {
        font-size: 14px;
        padding: 0.8em 0.5em;
    }

    .help-accordion:before {
        font-size: 18px;
        margin-right: 8px;
    }

    .help-panel.show {
        height: auto;
        margin: 1em 0;
    }

    .help-panel iframe {
        width: 100%;
        min-width: 100%;
        height: auto;
        min-height: 315px;
    }
}