Adding Vector Icons to Web Projects
These are the steps of how to add vector icons correctly to a web project assumed that the project is utilizing SVG sprite.
You can use SVGO SVG optimizer.
If there is icomoon project, you should create new project on IcoMoon or just simply import icon to the existing project.
You should use the grid provided by the design team. Vector icons should be within the correct grid. Otherwise, ask the designer to place the icons correctly in a grid.