Try using the following custom css.
To resize the header image:
.has-header-image .custom-header-media img, .custom-header-media img {
position: relative;
}
To resize the feature images:
.panel-image {
background-size: contain;
}
The css associated with sizing the featured images is as follows:
.panel-image {
background-repeat: no-repeat;
background-size: cover;
}
To get the featured image to fit the entire width of the browser window, add this to the custom css (or to twentyseventeen child):
.panel-image {
background-repeat: no-repeat;
background-size: contain;
}
To get the image to fit the window and repeat:
.panel-image {
background-repeat: repeat;
background-size: contain;
}
