1. Please add this code to the Theme Settings > Custom CSS > Global:
body .whb-sticked .woodmart-navigation .item-level-0>a:hover{
color:yellow;
}
2. You need to open your SVG icons file with some editor like Sublime Text or default system text editor and add the same width=”31″ and height=”40″ attributes to your <svg> tag like it is shown: http://prntscr.com/m4n0qw You can set your widths and height values.
Then you will need to re-upload your icons in WordPress Dashboard.
5. The image is too small that is why it has this look in the result of cropping, try other variants or upload images of the same size and proportion if it is possible.