.backImg{ width:100%;background-size:100% 100%; background-repeat:no-repeat;}
.backImg1{background-image:url(../images/Default01.jpg); height:270px;}
.backImg2{background-image:url(../images/Default02.jpg); height:359px;}
.backImg3{background-image:url(../images/Default_2018_03.jpg); height:410px;}
.backImg4{background-image:url(../images/Default_2018_04.jpg); height:120px;}
.backImg5{background-image:url(../images/Default05.jpg); padding-bottom:25px;}
.backImg6{background-image:url(../images/Default06.jpg); height:360px;}
.nav{ width:85%; margin:0 10%; }
.nav a{ width:40%; text-align:center; display:inline-block;margin-top:8%; margin-left:5%;}
.formback input{ float:left; margin-top:17px;border:0; background:0;}
#txt{ width:50%; height:20px; margin-left:20%;}
#btn{ width:10%; height:25px;}
.returnTop{text-align:center; border:1px solid #999; width:138px; height:20px; margin:20px auto;color:#757272}