summary {
    border: 1px solid black;
    outline: none;
    display: block;
    position: relative;
    padding: 12px;
    cursor:pointer;
}
details {
    max-width: 500px;
    box-sizing: border-box;
    margin-top: 5px;
    background: white;
}
details summary::-webkit-details-marker {
    display: none;
}
.content {
    border-top: none;
    padding: 10px;
    border: 2px solid #888;
    border-top: none;
}
img {
    max-width: 100%;
}