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.m-t-ico{background:url("../newindeximg/youshi_1_1.png") center no-repeat;width:120px;}.section2 .main-text .m-t-item:nth-of-type(2) .m-t-ico{background:url("../newindeximg/youshi_2.png") center no-repeat;width:120px;}.section2 .main-text .m-t-item:hover:nth-of-type(2) .m-t-ico{background:url("../newindeximg/youshi_2_1.png") center no-repeat;width:120px;}.section2 .main-text .m-t-item:nth-of-type(3) .m-t-ico{background:url("../newindeximg/youshi_3.png") center no-repeat;width:120px;}.section2 .main-text .m-t-item:hover:nth-of-type(3) .m-t-ico{background:url("../newindeximg/youshi_3_1.png") center no-repeat;width:120px;}.section2 .main-text .m-t-item:nth-of-type(4) .m-t-ico{background:url("../newindeximg/youshi_4.png") center no-repeat;width:120px;}.section2 .main-text .m-t-item:hover:nth-of-type(4) .m-t-ico{background:url("../newindeximg/youshi_4_1.png") center no-repeat;width:120px;}.section3{position:relative;z-index:2;padding-top:45px;width:1513px;height:657px;margin:0 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