.caption {
    position: absolute;
    bottom: 50px;
    left: 0;
    right: 0;
    text-align: center;
    color: white;
    font-size: 18px;
    background-color: rgba(0, 0, 0, 0.76);
    padding: 10px;
    border-radius: 5px;
    max-width: 90%;
    margin: auto;
    word-wrap: break-word;
}