.body { font-size: 18px; text-align: center;width: 600px; margin: 0 auto; }
#page-wrap { width: 600px; margin: 20px auto; }

#list-for-testing { list-style: none; }
#list-for-testing li { border: 1px solid #ccc; background: white; margin: 0 0 7px 0;padding: 4px; }
#list-for-testing li.selected { background: #ccc; }

#test-area { font-size: 32px; margin: 0 0 20px 0; }
#equation { vertical-align: middle; font-size: 18px; width: 80px; text-align: center; }