This is a nice simple look & feel. It’s really a utilitarian looking design and I kind of like that. There are some inconsistencies here and there, they could all be cleaned up to make a really nice little site/app.
Mastering Grids in UI Design: The Backbone of Visual Harmony
A modern guide to UI design grids, learn how to build flexible 12-column and 4-column systems, master margins, gutters, and modules, and apply today’s responsive layout best practices.
Love it!
Only thing to say would be to try and keep equal padding throughout the design.