Thank you, but I didn't use CSS, I just defined it in the HTML tag

Then write following code in your table tag

<table style="background-color:#E0E0E0;">

// YOUR CODE HERE.....

</table>

Thank you. It works for the whole table, but I need to mark each line with different colors. Then there is another problem. My font is too small

try this code and put it before your table tag

<style>

tr:nth-child(odd) {

background-color: #FF0000;

}

</style>

非常感谢，起作用了，但是我的html和css技术太差了，想要实现其他的效果我还要继续努力，再次感谢！

Thank you very much, it works, but my HTML and CSS technology is too poor, I have to continue to work hard to achieve other effects, thank you again!