#slideshow {
    position: relative;
    width: 633px;
    height: 424px;
    overflow: hidden;

    border: solid;
    box-sizing: border-box;
}

#slideshow img {
    position: absolute;
    top: 0;
    left: 0;
    width: 627px;
    height: 418px;

    opacity: 0;
    z-index: 1;

    transition: opacity 1s ease;
}

#slideshow img.active {
    opacity: 1;
    z-index: 2;
}

#hiroshima{
   background-color: #EAF4FF;
}