body {
    margin: 0;
    padding: 0;
}

header {
    background-color: #e1eefa;
}

footer {
    background-color: #cce4fa;
    border-top: 2px solid #0000FF;
}

.lightbox {
    display: none;
    position: fixed;
    z-index: 999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.8);
}

.lightbox-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
}

.close-lightbox {
    position: absolute;
    top: 20px;
    right: 45px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

.gallery-item {
    margin-bottom: 15px;
}

.gallery-item img {
    width: 100%;
    height: auto;
    cursor: pointer;
}