使用边距将 <div> 元素居中对齐。
Hint: Use the margin-left and margin-right properties.
In my younger and more vulnerable years my father gave me some advice that I've been turning over in my mind ever since.
'Whenever you feel like criticizing anyone,' he told me, 'just remember that all the people in this world haven't had the advantages that you've had.'
这将重置所有练习的分数。
您确定要继续吗?