Reduce height of install box back to 240px
Reduce height of install box back to 240px

Test Plan:
- locally on /plugin/fugitive-vim

divad12/vim-awesome,starcraftman/vim-awesome,vim-awesome/vim-awesome,shaialon/vim-awesome,starcraftman/vim-awesome,shaialon/vim-awesome,vim-awesome/vim-awesome,jonafato/vim-awesome,starcraftman/vim-awesome,jonafato/vim-awesome,divad12/vim-awesome,divad12/vim-awesome,vim-awesome/vim-awesome,shaialon/vim-awesome,vim-awesome/vim-awesome,jonafato/vim-awesome,vim-awesome/vim-awesome,divad12/vim-awesome,starcraftman/vim-awesome,shaialon/vim-awesome,jonafato/vim-awesome