.overlay {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    width: 100%;
    opacity: 0;
    transition: .3s ease;
    background-color: red;
}

/* When you mouse over the container, fade in the overlay icon*/
.overlay-container:hover .overlay {
    opacity: 1;
}

/* The icon inside the overlay is positioned in the middle vertically and horizontally */
.icon {
    color: white;
    font-size: 50px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    text-align: center;
}

/* When you move the mouse over the icon, change color */
.icon:hover {
    color: #eee;
}

/* --------------------------------------------- */

/* The Modal (background) */
.modal-fotos {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}

/* Modal Content/Box */
.contenido-modal {
    background-color: #fefefe;
    margin: 50px auto; /* 15% from the top and centered */
    padding: 20px;
    border: 1px solid #888;
    width: 600px;
    max-width: 100%;
    height: 450px;
    max-height: 100%;
}

/* The Close Button */
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover, .close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

/* ----------------------- */

img.banner {
    max-width: 75vw;
    height: auto;
}