I have just added header images to blog pages/posts, with a small animation to expand them to it’s full size on hover.

Images are contained inside a div element by using background-size: cover and expanded to full height with a max-height transition.

Note that the same image is used as background and inside a <img> tag. This is necessary to know the height of the image and allow the animation on hover. The <img> tag, however, is set to visibility: hidden, as it’s the centered background that we want to show.

The full SCSS and HTML code are bellow.

#header-image {
    width: 100%;
    max-height: 145px;
    overflow: hidden;
    background-image: none;
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    transition: max-height 1.5s ease-in-out;

    &:hover {
        max-height: 2000px;
    }

    img {
        visibility: hidden;
        width: 100%;
    }
}

<div id="header-image" style="background-image: url({{ page.image }})">
    <img src="{{ page.image }}">
</div>