Thanks for using my plugin!
You can change this code in css/wp-tiles-wud-base.css:
/* Background image */
.wp-tiles-wud-image{
position: absolute;
background-position: center;
height:100%; width:100%;
background-size: cover;
transition: all 1s ease;
-moz-transition: all 1s ease;
-ms-transition: all 1s ease;
-webkit-transition: all 1s ease;
-o-transition: all 1s ease;
}
To this:
.wp-tiles-wud-image {
position: absolute;
background-position: center;
height: 100%;
width: 100%;
background-repeat: no-repeat;
background-size: contain;
transition: all 1s ease;
-moz-transition: all 1s ease;
-ms-transition: all 1s ease;
-webkit-transition: all 1s ease;
-o-transition: all 1s ease;
}
Notice the extra line: background-repeat: no-repeat; and the changed line: background-size: contain; instead background-size: cover;
Regards, Danny