Hi, I did some modifications to my Checklist Module's Edit mode just to clean up the screen a little. Figured I'd share if anyone else can find it useful. Also curious to see what other modifications others have made to the styling of this module.
Before:
After: 
/* Padding Under Button */
#page-mod-checklist-edit .checklist.checklist-extendedit .btn {margin-bottom: 15px;}
/* Add Row Color on Hover */
#page-mod-checklist-edit ol.checklist li:hover {background: #d6e6e7;}
/* Padding Between Checkbox and Label */
#page-mod-checklist-edit li label {margin-left: 10px!important;}
/* Right - Align Activity Icons */
#page-mod-checklist-edit li img.icon {float: right;}
/* Reduce Width between Labels and Icons*/
#page-mod-checklist-edit ol form {width: max-content;}
/* Style Background Colors of Enabled Checklist Items */
#page-mod-checklist-edit ol.checklist .itemauto {background-color: initial;}
/* Style Background Colors of Disabled Checklist Items */
#page-mod-checklist-edit ol.checklist .itemauto.itemdisabled {text-decoration: line-through; background-color: #bcc4c4; color: #666;}