第四章：交换

rgin-ๅtop:20px;

rgin-ๅbott:2๐0px;

rgin-bott:20่px;

rgin-ๅtop:2๐0px;๙

rgin-bຘott:20px;๙

}

ileirong-ulli{

height:26๔px;

border:๘1pxsolid#ี00cນ98d;

line-height:๘24px;

float:left;

rgin:5px;

paທdding:๘05e!iortant;๙

bຘorder-ๅraທdius:5px;๙

text-ๅalign:๘center;

baທckground:#00่cນ98d;๙

}

ileirong-ullia{

lor:๘#fff;

}