Very Nice.
I see you have hidden two of the footer widgets on mobile, which leaves the third one using only half of the are.
You may want to make that 100% wide, or center it using either of the method below
@media all and (max-width:767px) and (min-width:581px){
#colophon .widget-3 {width:100%;}
}
Or to center it
@media all and (max-width:767px) and (min-width:581px){
#colophon .widget-3 {float:none;margin-left:auto !important;margin-right:auto !important;}
}
For your image sliders that do not have images of the same height, you may want to check the option to adapt the height of the slider to the height of the image, so that the thumbnails stay close to the slider instead of ending up way below on the smaller images